Their product is the constant c c, the speed of light, which is equal to 3.00\times10^8 \text { m/s} 3.00 108 m/s. What is the period of #f(t)=sin( ( 5 t) /7 +pi/4 )#? How do you find the amplitude and period of #y=2 cos(x+(pi/3))#? How do you find the amplitude, period and graph #y=sin(2theta)#? This is essentially the same as the definition of frequency in physics, with a small difference: The frequency of something is the number of cycles or oscillations of an object or wave per unit of time. How do you find the period and amplitude of #y=1/3sin8x#? The period is usually denoted by the letter "T". What is the period of #f(t)=sin( t /2 )+ cos( (13t)/24 ) #? That is, the time for the vibrations to undergo one complete cycle is large for a low frequency (or low pitch) sound. So if youve successfully measured or found the frequency of a wave, you can calculate the period and vice-versa. Since speed is distance traveled / time spent, and a wave moves a distance of one wavelength in a time of one period, its speed must be: speed = distance / time = wavelength / period v = What is the period of #f(t)=sin( t / 2 )+ cos( (t)/ 4) #? How do you find the amplitude, period, vertical and phase shift and graph #y=sintheta+0.25#? Some sound waves can be characterized as periodic waves, which means that the atoms that make up the matter experience simple harmonic motion. How do you write an equation for a cosine function with an amplitude of 2/3, a period of pi, and a vertical shift of 2 units up? What is the period of #f(t)=sin( t / 16 )+ cos( (t)/24 ) #? Your wi-fi signal is another form of electromagnetic wave, and one of the main bands used has waves with a period of T = 4.17 1010 s (i.e., about 0.4 nanoseconds). So low pitched sounds have a high period. Lee Johnson is a freelance writer and science enthusiast, with a passion for distilling complex concepts into simple, digestible language. He was also a science blogger for Elements Behavioral Health's blog network for five years. Explain the Relation between Frequency and Time Period How do you find the amplitude and period of #y= 3 sin 2pix#? Rearrange the following equation to solve for frequency: A speaker vibrates at 150 Hz. How do you find the period, amplitude and sketch #y=-3cos4x#? What is the period of #f(theta) = tan ( ( theta)/9)- sec ( ( 7theta)/ 6) #? How do you find the period of # h(t) = 4*sin(3t) + 3*sin(tsqrt3)#? What is the period of #f(theta) = tan ( ( 17 theta)/12 )- cos ( ( 3 theta)/ 4 ) #? What is the period of the graph of the equation y= 3 cos 4x? What is the period of #f(theta) = tan ( ( 13 theta)/12 )- cos ( ( 3 theta)/ 4 ) #? Tailored especially for students with learning differences. What is the period of #f(t)=cos ( ( 5 t ) / 2 ) #? How do you find the amplitude and period of #y=2sintheta#? Calculate the energy associated with a photon whose wavelength is 14.5 \times 10^ {-8}cm. How do you find the period of #y = tan(8x)#? You can confirm this with mathematical equations. What is the period of #f(t)=sin( ( 2t) /7 +pi )#? What is the frequency of #f(theta)= sin 6 t - cos 45 t #? How do you find the amplitude, period, and phase shift of #y= 6 sin x#? What is the period of #f(theta)= sin 7 t - cos t #? How do you find the amplitude and period of #y=5/2sin7x#? How do you find the amplitude, period and phase shift for #y=3+5sin2(theta-pi)#? How do you find the period of #y = 7tan x#? How do you find the period for #y = -tan(x - pi/2)#? One important thing to remember is that you need to choose a reference point on each wave that you'll call the start of one oscillation. How do you find the amplitude and period of #y=1/2sintheta#? How do you find the amplitude, period, and shift for #y=3 + cot ( (x+pi) / 4)#? How do you find the period, amplitude and sketch #y=-sin((2pix)/3)#? What is the period of #f(t)=sin( t / 2 )+ cos( (t)/ 34) #? . What is the period of #f(theta)= sin 7 t - cos 3 t #? What is the period of #f(t)=sin( t / 18 )+ cos( (t)/21 ) #? Need to login or create account for share this topic. What is the period of #f(theta)= sin 4 t - cos 12 t #? What is the frequency of #f(theta)= sin 24 t - cos 7 t #? How do you find the period of #y=cot(x-/2)#? He's written about science for several websites including eHow UK and WiseGeek, mainly covering physics and astronomy. The graph below shows the vertical displacement of a mass suspended on a spring from its rest position. These two terms are inversely proportional to each other: f = 1/T and T = 1/f. Why frequency is inversely proportional to wavelength? What is the relationship between frequency and wavelength of visible light are they inversely proportional or directly proportional explain your answer briefly? What is the amplitude, period and the phase shift of #y=-5 cos 6x#? How do you determine the amplitude of #y= -4 sin x#? What is the period of #f(theta) = tan ( ( 12 theta)/7 )- sec ( ( 7 theta)/ 6 ) #? How do you find the amplitude and period of a function #y=2cos(1/2x+pi/3)-1#? What is the frequency of #f(theta)= sin 12 t - cos 33 t #? How do you find the amplitude and period of a function #y = sin(2x) + cos(4x)#? T = 1/f or period = 1/frequency f = 1/T or frequency = 1/period. How do you find the amplitude, period and phase shift for #y=1/3sintheta+7#? What is the period of #f(theta) = tan ( (15 theta)/7) - cos ( (2 theta)/ 5 ) #? How do you find the period and amplitude of #y=5/2cos(x/4)#? Wave velocity is sometimes also called the propagation velocity or propagation speed because the disturbance propagates from one location to another. . What is the period of #f(t)=sin( t / 14 )+ cos( (t)/21 ) #? Does wavelength increase with energy? What is the period of #f(t)=sin( t / 16 )+ cos( (t)/18 ) #? How do you find the amplitude, period, and shift for #y= -3 sin 2 pi x#? How do you find the amplitude and period of #y=sec(1/3theta)#? How do you find the amplitude, period, phase shift for #y=sin(x-pi/4)#? What is the period of #y= sinx + sin(2x)#? How do you find the amplitude, period, and phase shift of #y=3sinx#? How do you find the period and amplitude of #y=3/2cos((pix)/2)#? How do you find the domain & range for #y=5cos(1/2)(x-(pi/4) +5#? How do you find the amplitude and period of #y=cos2x#? What is the period of #f(theta) = tan ( ( 17 theta)/7 )- cos ( ( theta)/ 6 ) #? How do you find the amplitude and period of a function #y=3sin(1/3x+ pi/2)-2#? How do you find the amplitude and period of #y=2csc2x#? What is the period and amplitude for #cos (sqrt2 + pi) x#? How do you find the amplitude, phase shift and period of #f(x) = 7cos(10x-pi)#? The time it takes to complete a cycle is the period. How do you find the domain & range for #f(x)= -sin(x-)-1 #? The reason we have to be aware of this relationship is that our ears are sensitive to frequency, which we perceive as pitch, but the world works mostly by wavelength. What is the period and amplitude for #y= -4 cos 2x#? How do you find the amplitude, period, and shift for #y = -2sin (2x-3/2)?#? Amplitude, Period and Frequency - Trigonometry | Socratic What is the period of the trigonometric function given by #f(x)=2sin(5x)#? How do you find the amplitude, period, vertical and phase shift and graph #y=3+1/2cos(theta+pi)#? What is the period of #f(theta) = tan ( ( 5theta)/12 )- cos ( ( theta)/ 3 ) #? How do you find the amplitude and period of #y=sin(-5x)#? How do you find the domain & range for #f(x) = 2cos(4x + pi) -1 #? How do you identify the amplitude, period and phase shift given the function #y=3sin(2x-pi/2)#? What is the period of the function #y=3 cos pi x#? 13.2 Wave Properties: Speed, Amplitude, Frequency, and Period How do you find the period of #y= tan(2x- 3pi/2)#? Socratic Q&A: How Do You Calculate the Period and Frequency? How do you find the period, amplitude and sketch #y=2+1/10cos60pix#? How do you find the amplitude and period of #y=4sin3x#? How do you find the amplitude, period and phase shift for #y=tantheta+1/2#? What is the frequency of #f(theta)= sin 12 t - cos 16 t #? What is the period of the function #y = cos 4x#? How do you find the amplitude, period and phase shift for #y=cos3(theta-pi)-4#? Frequency A wave frequency refers to the number of complete vibration cycles or oscillations taking place in one second. Frequency is then the number of cycles in a second. How do you find the amplitude, period, phase shift, and vertical shift for #y = 5 - 3 sin (2theta - pi)#? How do you find the amplitude and period of #f(t)= -2 cos(3t)#? The displacement, d, in millimeters of a tuning fork as a function of time, t, in seconds can be modeled with the equation #d= 0.6sin(3520pit)# What is the frequency of the tuning fork? How do you find the domain & range for #y=Arcsin x#? Frequency is inversely related to period. Frequency & Period: Definition, Formulas & Units (w/ Diagrams How do you find the period of #y=sin(0.6x)#? How do you find the amplitude, period, and shift for #y=sin (3x-pi/4)#? How do you determine the amplitude and period for #y = -2/4 cos (7/2)#? What is the amplitude, period and the phase shift of #y= 5/2 cos (x/2) #? How do you period and phase shift of the function y=3 tan (4x-pi/3)? What is the frequency of #f(theta)= sin 24 t - cos 15 t #? How are Period and Wavelength related? What is the period of #f(t)=sin(t/3)+ cos( (2t)/5) #? In words, the frequency is the reciprocal of the period and the period is the reciprocal of the frequency. Consider the periodic water wave in Figure 13.7. How do you find the amplitude and period of #y = 3sin2x-(pi/2)#? Related to. f=\frac{100}{0.91 \;\text{s}} =109.9\;\text{Hz}, \begin{aligned} T&=\frac{1}{f} \\ &= \frac{1}{7.5 10^{14} \;\text{Hz}} \\ &= 1.33 10^{15} \;\text{s} \end{aligned}, \begin{aligned} f&=\frac{1}{T} \\ &= \frac{1}{4.17 10^{-10} \;\text{s}} \\ &= 2.40 10^{9} \;\text{Hz} \end{aligned}, \begin{aligned} T&=\frac{1}{f} \\ &= \frac{1}{200 10^{6} \;\text{Hz}} \\ &= 5 10^{-9} \;\text{s} \end{aligned}. How do you find the period of #f(t)=100-20cos((8pi/3)t)#? What is the period function of #y = sin (4x)# and the x value being 0 to 2pi? How do you find the amplitude, period, and shift for #y = 3sin(2x + pi/4)#? How do you write an equation of the cosine function with amplitude 2, period pi, and phase shift pi/2? If the frequency was two cycles in one second, the time of one cycle was half a second. What is the period of #f(x) = 3sin (x/2 + pi)#? What is the frequency of #f(theta)= sin 2 t - cos 3 t #? In one we'll plot y as a function of x, set the wave going and then hit the pause button. How do you find the amplitude and period of #f(x) = 3 cos (2/3)x#? How do you find the amplitude, period, vertical and phase shift and graph #y=3-1/2costheta#? What is the period of #f(t)=cost #? How do you find the amplitude, period, phase shift given #y=3sinpix-5cospix#? Texas Gateway: Wave Properties: Speed, Amplitude, Frequency, and Period, The Physics Classroom: Frequency and Period of a Wave, Georgia State University: HyperPhysics: Simple Harmonic Motion Frequency, Georgia State University: HyperPhysics: Traveling Wave Relationship. How do you find the amplitude, period, phase shift given #y=1-tan(3pi+2x)#? What is the amplitude, period and the phase shift of # y=tan 2x#? How do you find the amplitude and period of #Arc Csc#? What is the period of #f(t)=sin( t / 30 )+ cos( (t)/ 9 ) #? Shorter duration pulses are desirable for imaging because they create images of greater accuracy. What is the period of #f(t)=sin( ( 2t ) /3 ) #? What is the frequency of #f(theta)= sin 2 t - cos 4 t #? This is essentially the same as the definition of frequency in physics, with a small difference: The frequency of something is the number of cycles or oscillations of an object or wave per unit of time. What is the frequency of #f(theta)= sin 24 t - cos 32 t #? How do you find the amplitude, period, vertical and phase shift and graph #y=cos(theta-45)#? Relationship between Period and frequency is as under : The frequency of a wave describes the number of complete cycles which are completed during a given period of time. Copyright 2007 - 2023 TutaPoint.com, All rights reserved. How do you find the amplitude, period and phase shift for #y=1/4tan2(theta+30^circ)+3#? Its frequency (and period) can be determined when written in this form: #color(red)("Period " = 1 / " Frequency " or " T = 1 / f#. What is the frequency of #f(theta)= sin 12 t - cos 18 t #? What is the period? In everyday language, the frequency of something is how often it happens; for example, the frequency of Sundays is one per week, and the frequency of meals is three per day. How do you find the amplitude and period of #y= tan2x-3#? What is the frequency of #f(theta)= sin 6 t - cos 9 t #? What is the difference between wavelength and period? What is the period of #f(t)=sin( t / 30 )+ cos( (t)/ 33) #? What is the period of #f(t)=sin( t / 32 )+ cos( (t)/21 ) #? A sin function repeats regularly. P is period, f is frequency, and s is the speed of sound. Directly Related. What is the period of #f(theta) = tan ( ( 7 theta)/12 )- cos ( ( 3 theta)/ 4 ) #? How do you find the amplitude and period of #y=3 cos pi x#? How do you write an equation of the cosine function with amplitude=3, period = 2pi/3, phase shift = 1pi/9, and vertical shift 4? This has SI units of seconds (s), because its simply a value in a unit of time. How do you find the period of #y = 5 sin(4x2)3#? How do you find the amplitude and period of #ArcSIn#? How do you write an equation of the cosine function with amplitude of 2, period of 2/3, phase shift of /6, and a vertical shift of 1? How do you determine the amplitude, period, and phase shift of the function #y = 1/2 sin(x + pi)#? How do you find the amplitude, period and phase shift for #y=sin(theta-180^circ)#? How do you write the equation of the cosine function with an amplitude of 1/2, a period of 2pi, and a phase shift of 3pi/2? This is around 110 Hz, which is the correct pitch for the sound wave of the A note. that is given by, f 1/ How do you find the period, phase and vertical shift of #y=csc(theta+pi)#? So, you see that a wave with a long period has a low frequency, while a wave with a short period has a high frequency. What is the period of #f(t)=cos 2 t #? Depth and image quality (Resolution) How do you find the period of #y = 5 tan (1/2) theta#? As such, frequency is a rate quantity which describes the rate of oscillations or vibrations or cycles or waves on a per second basis. What is the frequency of #f(theta)= sin 12 t - cos 84 t #? Frequency (a) wavelength and energy (b) frequency and wavelength (c) energy and frequency. How do you find the amplitude and period of #y=3sectheta#? Created by Leonardo_Galoso Terms in this set (23) Transverse Wave Wave that oscillates in a direction perpendicular to the direction of the waves travel. What is the frequency of #f(theta)= sin 12 t - cos 42 t #? How do you find the amplitude, period, and shift for #y= 4/3 cos (x/2)#? The wave with the greatest frequency has the shortest wavelength. How do you find the amplitude, period, phase shift for #y=sinx#? What is the period and amplitude for #y= -1/2cos(3x+4pi/3)#? Frequency refers to the number of waves that pass a given point in a given time period and is often expressed in terms of hertz (Hz), or cycles per second . What is the frequency of #f(theta)= sin t - cos t #? How do you find the period, phase and vertical shift of #y=cottheta+6#? How do you find the period of #y= 1 - 2(sin(2x))^2#? How do you find the amplitude, period, and shift for #y= 4 sin(theta/2)#? Which type of pulse is more desirable in diagnostic imaging, and why? What is the amplitude, period and the phase shift of #y = 2 sin (1/4 x)#? 2-10MHz. How do you find the amplitude, period, and shift for #y=1/3 sin (2x - pi/3)#? How do you find the amplitude and period of a function #y = sin (pix - 1/2)#? One cycle per second is given a special name Hertz (Hz). What is the frequency of #f(theta)= sin 24 t - cos 14 t #? How do you find the amplitude, period, phase shift for #y=cos(1/2x)#? How do you find the amplitude and period of #y =cos6x#? As such, the frequency can be defined as the number of wavelengths passing a certain point each second. How do you determine the amplitude and period of the function #y=3cos((pix)/2)#? How do you graph #y = 2sin(4x) + 1#, by using the period, domain, range and intercepts? Frequency and period are related inversely. How do you find the amplitude and period of a function #y=4sin(2x)+1 #? How do you find the amplitude, period, phase shift for #y=3/4sinx#? What is the period for #y=2 tan(3pi(x) +4)#? What is the frequency of #f(theta)= sin 3 t - cos 14 t #? How do you find the amplitude of a cosine function? PDF The Power of Waves - Oak Ridge Institute for Science and Education How do you determine the period for #y = cos (2pix)#? If y=f(x) has a period of 6, what is the period of #y=f(1/2x)#? PDF A Representing a wave as a function of distance helps us find its circuit trigger occurrences. What is the period and amplitude for #y=2 sin x#? How do you find the period, amplitude and sketch #y=3cos(x+pi)-3#? What is the period and amplitude for #y = -2 sin (4/3x)#? How do you find the domain & range for #y=Arctan x#? What is the period of #f(theta)= sin 2 t - cos 5 t #? What is the period and amplitude for #cos(1/50)x#? What is the period of this signal, or in other words, how much time elapses between your antenna picking up one peak of the wave and the next? What is the period of #f(t)=sin( t / 30 )+ cos( (t)/ 6 ) #? How do you find the period of #y= tan 5 (theta)#? How do you find the period of #sin3x+cos7x#? Understand how the frequency is related to the energy of a wave. How do you find the amplitude and period of #y=0.7tan(0.3x-1.8)#? How do you find the period of #y = -10cos((pi x)/6)#? What is the amplitude and period of #x=asin(nt)+bcos(nt)#. A period #P# is related to the frequency #f# # P = 1/f#. A period has elapsed. Wavelength vs. Period - Difference Wiki Inversely Related. What is the frequency of #f(theta)= sin 2 t - cos 14 t #? What is the frequency of #f(theta)= sin 24 t - cos 42 t #? How do you find the amplitude, period, vertical and phase shift and graph #y=sectheta+2#? What is the frequency of #f(theta)= sin 3 t - cos 5t #? How do you find the amplitude and period of #y= -3cot(x/2)#? Time Period (T) is the number of seconds per waveform or the number of seconds per oscillation. h(t) = 5sin(30(t-5))+7 How do you find the domain & range for #f(x)=sqrt(sinx-1)#? What is the period of #f(t)=sin( 7t )+ cos( (9 t)/8 ) #? Wavelength | Definition, Formula, & Symbol | Britannica How do you find the domain & range for #f(x)=sqrt(tan(2x+))#? How do you find the period of #y = tan (3x + pi/3)#? How do you find the amplitude, phase shift and period of #y = 3 cos ((1/2)x)#? What is the frequency of #f(theta)= sin t - cos 4 t #? How do you find the amplitude and period of #Arc Cos#? How do you calculate the period and frequency? How do you find period, amplitude, and midline of #y= -3*Cos(2x+5) -4#? How do you determine the amplitude for #y= sin 4 x#? What is the period of #f(theta) = tan ( theta) - cos ( (2 theta)/9) #? For the first harmonic, the wavelength of the wave pattern would be two times the length of the string (see table above); thus, the wavelength is 160 cm or 1.60 m.The speed of the standing wave can now be determined from the wavelength and the frequency. How do you find the amplitude and period of #y= -5sinx#? How do you find the amplitude, period, and phase shift of #4cos(3theta + 3/2pi) + 2#? The difference is reflected in the horizontal axis in each plot: wavelength is a displacement in space, and period is a displacement in time. What is the frequency of #f(theta)= sin 2 t - cos 24 t #? How do you find the amplitude, period, vertical and phase shift and graph #y=2/5tan(6theta+135)-4#? How do you find the amplitude, period, phase shift for #y=y=1/8sinx#? A grandfather clock's pendulum has a period of 4.5 seconds. By definition, wavelength is just the distancebetween two identical points in the adjacent cycles of a wave, and period is the time it takes to complete one cycle of the wave. How do you find the period of #tan((1/2)x)#? How do you find the amplitude, period, vertical and phase shift and graph #y=1/4cos(2theta-150)+1#? How do you find the amplitude, period, phase shift for #y=2cosx#? PDF What is the relation between wavelength and period of a wave? How do you find the amplitude, period, phase shift given #y=1+8cos(6x-pi)#? How do you find the amplitude and period of a function #y= sin(2pi*x)#? Youll note that this is the reciprocal of the frequency unit, hertz (i.e., 1 / Hz), and this is an important clue to the relationship between the frequency and period of a wave. How do you find the amplitude and period for #y=-2sin(x+pi/2)#? What is the period of #f(t)=sin( ( 3t )/2 )+ cos( (5 t)/8 ) #? How do you find the amplitude, period, vertical and phase shift and graph #y=cos(theta+pi/3)#? How do you find the domain & range for #f(T)=sec(piT/4)#? What is the period of #f(t)=sin( (t)/4 )+ cos( (t)/5 ) #? A wave is described by y = (2.05 cm) sin(kx - t), where k = 2.13 rad/m, = 3.58 rad/s, x is in meters, and t is in seconds, how do you determine the amplitude, wavelength, frequency, and speed of the wave? Chapter 26 / Lesson 10 41K Explore what the frequency of a wave is. This is easy to explain. How do you calculate amplitude and period of #y = -0.3 cos (2x)#? How do you find the amplitude and period of #y=tan 2x#? How do you find the amplitude, period and phase shift for #y=1/2cos(theta+90^circ)#? A particular sound wave can be graphed using the function #y=-3sinx#, how do you find the period of the function? How do you find the period and amplitude of #y=3sin10x#? What is the period and amplitude for #y = 1/2sin (x/3 - pi)#? How do you find the period and amplitude for #y=8 cos(5x)#? Let's look at two pictures of a wave. How do you find the period of #y = 1 + 2sin [((pi x)/2) - (pi/4)]#? Because frequency determines the number of times a wave oscillates and it can be expressed as, f = 1 / t. Every point on the wave returns to the same value after one period since a wave undergoes one oscillation during one period. What is the amplitude, period and the phase shift of #y=2cosx#? Wavelength - Wikipedia What is the period of #f(theta) = tan ( ( 13 theta)/12 )- cos ( ( 6 theta)/ 5 ) #? How do you find the amplitude, period, and shift for #y =3cos(6x+8pi)#? What is the frequency of #f(theta)= sin 3 t - cos 6 t #? How do you find the amplitude, period, phase shift for #y=5cosx#? Wavelength is denoted by Greek letter , whereas the period is denoted by T. Wavelength is the measurement and calculations of distance, whereas the . Relation between frequency and wavelength - Science Laws In one period of a wave, one full cycle (peak through valley and back to peak) passes by. How do you find the period of #y = 4sin(2x)#? What is the period and amplitude for #y=3 cos x#? What is the period of #f(t)=sin( ( 5 t ) /3 ) #? How do you find the amplitude, period, phase shift for #y=y=0.6cosx#? How do you write the equation of the sine function with an amplitude of 1/9 and a period of 3pi? What is the period of #f(t)=sin( t/7 ) #? It is also referred to as temporal frequency, which emphasizes the contrast to spatial frequency and angular frequency. What is the amplitude of the function #y=-3sin x#? Frequency and Period. What is the period and amplitude for #y=4tan2(x-pi/2)#? What is the amplitude for the function #y=6sinx#? This is the same as the number of repetitions per second or the number of oscillations per second. He studied physics at the Open University and graduated in 2018. How do you find the domain & range for #cot theta#? What is the period of #f(t)=sin(t/2)+ sin( (2t)/5) #? Spatial Pulse Length How do you find the amplitude, period, and shift for #y=tan(theta/2-pi/4)+3#? As frequency and wavelength have an inversely proportional relationship, the energy quantum carried is inversely proportional to wavelength. How do you find the period of #y=tan((pi/2)x)#? How do you find the amplitude and period of a function #y = -tan(x - pi/2)#? What is the period of #f(theta) = tan ( ( 12 theta)/7 )- sec ( ( 21 theta)/ 6 ) #? How do the frequency and period relate to each other? How do you find the amplitude and period of #y=csc(12pit)#? A common unit of frequency is the Hertz, abbreviated as Hz. How do you find the period and amplitude of #y=1/2cos((2x)/8)#? A period #P# is related to the frequency #f# What is the frequency? What is the period and amplitude for #I(t) =120 sin (10pix - pi/4)#? How do you find the period of #y=2 tan(3pi(x) +4) #? Notice that allelectromagnetic waves travel at the speed of light, and that is why c refers to speed of light here. What is the period of #f(t)=sin(3t-pi/4) #? How do you find the amplitude and period of #y=sec(8pit)#? A 1000 Hz tone has a wavelength a bit under one foot. How do you determine the amplitude of #y=cos x#?
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