7. Evaluate the contour integral fc (²+1)(2-1)dz along the following contours (a) C |zi| = 1, counter-clockwise; (b) C = C₁ U C2, C₁ |zi|=1,counter-clockwise; C₂=2+ i=1,clockwise; (c) C = C₁UC₂, C₁: 2 - 1] = 1, counter-clockwise; C₂: |2 + 1 = 1, clockwise.

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