Asked by Han

How do you know what the period of this function is: y=2cos3(x+45')? Explain.
Answered by Steve
y = 2cos(3x+135)

cos(kx) has period 2pi/k, so y has period 2pi/3.

The 135 is just a phase shift, and does not affect the period.
Answered by Han
Ok thanks a lot for your help steve :D