Question

What are the phase shift and period for the function y = 3cos[4(θ + 60°)] − 2?

Phase shift = right 60°, period = 90°

 Phase shift = right 60°, period = −90°

 Phase shift = left 60°, period = 90°

 Phase shift = left 60°, period = −90°

Answer 1

The plus sign inside the parenthesis indicates that the shift is to the left, And the formula for the period is 2pi/B and our B is 4, so 2pi/4 = pi/2 which is 90. So your answer is the third one down, left 60 period 90