Find S. (12z+ z²) dz, where C is the boundary of the rectangle with vertices at the points 1+2i, – 1 + 2i, – 1 – 2i, 1 – 2i. Also find the residue of f(2) = (1+ 3z + 3z² + z®)(1 – z)-1 (1–)* at z=0. %3D

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