Let f (z) = 270 = Q A = 9and B = 9+ 9i Let C1 be the contour composed of the line segments O Aand AB(in this order). Let C, denote the line segment || OB Finally, let C3 denote the semicircular arc from Bto O. B C3 C2 C1 A Find I f (2) dzand write it as a + ib where a and b are real numbers. What is b – a?

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