I want to find the Taylor series for the function $$f(z)=\frac{e^z}{\cos z}$$
I found this post (Maclaurin series for $e^z /\cos z$.) but the answer doesn't do it for me. I know the radius of convergence will be $z<π/2$. I am looking for a simpler trick to find the series without having to resort to Euler Numbers and Delta functions. Can someone help?