How do you find the amplitude and period of a function y=3 cos x?

1 Answer
Nov 4, 2015

The amplitude is 3, the period is 2pi and (if you cared) the phase change is (0, 0).

Explanation:

The equation can be written as a cos(b(x-c)) + d. For sin and cos (but not tan) |a| is the amplitude, (2pi)/|b| is the period, and c and d are the phase shifts. c is the phase shift to the right (positive x direction) and d is the phase shift up (positive y direction). Hope this helps!