mmm lets randomly take...
$ \sin4\pi t + \cos3\pi t + e^{j2\pi t} $
Remeber... $ x(t) = \sum^{\infty}_{k = -\infty} a_k e^{jk\pi t}\, $
$ a_k=\frac{1}{T} \int_0^Tx(t)e^{-jk\omega_ot}dt $
