How do you find the amplitude, period, phase shift for #y=cos(xpi/2)#?
1 Answer
Feb 27, 2017
Amplitude
Period
Phase Shift
Explanation:
In a more generalised form, a cosine function can be written as:

#A# is the amplitude; 
#k# is the wavenumber. Note that#k = (2 pi) / lambda# , where#lambda# is the wavelength or spatial period; and 
Finally,
#psi/k# is the phase shift.
We can read these straight off the original equation as:
Note that this is the phase shift from a vanilla cosine function. Sines and cosines are the same but for a phase shift and so this could also be related to a sine function with a different shift.