Question

What is the period of `f(t)=cos 7 t`?

Answer 1

`(2pi)/7`

Explanation:

A general cosine graph of form `y=AcosBt` has period `T=(2pi)/B`. This represents the time taken for 1 complete cycle of the graph to pass.

So in this particular case, the period is `T=(2pi)/7` radians.

Graphically :

graph{cos(7x) [-3.57, 4.224, -1.834, 2.062]}