Complex Analysis - Contour Integration

If C is the unit circle in the complex plane with its center at the origin, then the value of n in the equation given below is ________ (rounded off to 1 decimal place). $\oint_C \frac{z^3}{(z^2+4)(z^2-4)} dz = 2 \pi i n...

Let C represent the unit circle centered at origin in the complex plane, and complex variable, z = x + iy. The value of the contour integral $\oint_C \frac{\cosh 3z}{2z} dz$ (where integration is taken counter clockwise)...