How do you find the complex $(C_n)$ fourier series expansion of $e^{ax}$? The period of the function is 2$\pi$. I've tried to do this question out several times, and I keep getting stuck and don't know how to proceed.
I have got to the point $C_n$ = $\frac{1}{2\pi}$[$\frac{-1^n(e^{a \pi}-e^{-a \pi}) }{a-in}$]
I am not sure where to proceed from here