Question

What is the frequency of `f(theta)= sin 24 t - cos 21 t`?

Answer 1

`2pi`

Explanation:

Period of sin (24t) --> `(2pi)/24 = pi/12`
Period of cos (21t) --> `(2pi)/21`
Least common multiple of `pi/12 and (2pi)/21`

`pi/12` ...x (24) ...--> `2pi`
`(2pi)/21` ....x (21)...--> `2pi`

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