Evaluate $\int_{C}\frac{\sin\pi(z+1)+\cos\pi z}{(z-1)(z-2)}dz$

536 Views Asked by At

$$\int_{C}\frac{\sin\pi(z+1)+\cos\pi z}{(z-1)(z-2)}dz\,\,\,\,\,\,\,\,C:|z|=4$$

My try:

Applying Cauchy's Integral formula

$$2\pi i\bigg[\frac{\sin\pi(z+1)+\cos\pi z}{z-1}\bigg]_{z=2}+2\pi i\bigg[\frac{\sin\pi(z+1)+\cos\pi z}{z-2}\bigg]_{z=1}=2\pi i+2\pi i=4\pi i$$

My attempt is correct?