What is the period and amplitude and frequency for s = 3 cos 5t?

1 Answer
May 5, 2015

cosinus oscillates between 1 and -1 so of you are multipliying it by 3 it oscillates between 3 an -3, you amplitude is 3 .
cos(0)=cos(2pi) this is the condition for a cycle. so for your equation cos(5·0=0)=cos(5·t=2pi) you have to solve 5t=2pi which solution is t=2pi/5 after this t you've made a complete cycle so t is the period