Evaluate the complex integral$\oint\tan(z)\,dz$ around various contours C

Question

I can expand $\tan(z)=\dfrac{\sin(z)}{\cos(z)}$ . Then the poles are z = (2n+1)$\pi$/2 where n=0,-1,+1,-2,+2....

So there is an infinite number of poles and thus residues. So how do I evaluate this function?