Question

Which of the following equations has amplitude = 2, period =pi/4 , and phase shift =pi/2 ?

y = 2cos8(x - pi/2)
y = 2cos8(x +pi/2 )
y = 2cos4(x -pi/2 )
y = 2cos4(x +pi/2 )

Answer 1

When discussing the cosine function, we use the general expression

y = a cos (bx + c), where

a=the amplitude

2pi/b = the period

-c/b = the phase shift

See what you can figure out on your own from this info, and then return here if you still need more guidance.

Answer 2

i already got the answer and turned it in thanks