# What is the frequency of f(theta)= sin 18 t - cos 32 t ?

$\pi$
Frequency of $\sin \left(18 t\right) - \to \frac{2 \pi}{18} = \frac{\pi}{9}$
Frequency of $\cos \left(32 t\right) - \to \frac{2 \pi}{32} = \frac{\pi}{16}$
Find least common multiple of $\frac{\pi}{9} \mathmr{and} \frac{\pi}{16}$
Frequency of $f \left(t\right) - \to \pi$