Question

What is the period and frequency for `5cos20t`?

Answer 1

The Period is given using `20` in the form of: `(period)=(2pi)/color(red)(20)=pi/10 sec`, that represents the time taken to complete one oscillation.
The Frequency is `f=1/(period)=10/pi s^-1 (Hertz)`, that represents the number of oscillations in `1 sec`.