Question

What is the frequency of `f(theta)= sin 6 t - cos 15 t`?

Answer 1

`2pi`

Explanation:

Frequency of sin 6t --> `(2pi)/6 = pi/3`
Frequency of cos 15t --> `(2pi)/15`
Find least common multiple of `pi/3 and (2pi)/5`
`pi/3` ... x (3)(2) ... --> `2pi`
`(2pi)/15` ...x.(15) ...--> `2pi`

Frequency of f(t) --> `2pi`