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 -1 f(2) = ÷(1 + 3z + 3z² + z®)(1 – 2)-1 (1–)* at z=0. %3D

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