Question

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

Answer 1

The function can be expanded as follows:
$y=3\ cos(4\theta+240)-2$
The phase shift is:
$\frac{240}{4}=60\ degrees$
The period is:
$\frac{2\pi}{4}=\frac{\pi}{2}$