1. Evaluate [(y - x - 3ix²) dz, where C' is the contour joining 0 and 1+ i in the following manners: (a) C is the straight line from 0 to 1 + i. (b) C is the straight line from 0 to i and then the straight line from i to 1+i. (c) C is the parabola y = x².

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