Problem 1606 (difficulty: 2/10)

\(\displaystyle \int\limits_{|z|=2} \frac{3^z}{(z-1)^2(z+3)^2}\dz =? \)

Give me another random problem!

Subject, section:
Requested difficulty:
Request for a concrete problem:I want problem no.

Supported by the Higher Education Restructuring Fund allocated to ELTE by the Hungarian Government