Let a, b e C with |a| # 1, |b| # 1. Evaluate the integral dz (z – a)(z – b) 70,1 in the following cases: (i) Ja| < 1< [b], (ii) a = b, |a| < 1, %3D (iii) a + b, |a| < 1 and |b| < 1. The contour y20,r is a circle of radius r with centre zo (positive orientation).

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