Let f (z) = 470 = Q A = 2and B= 2 + 2Let C1 be the contour composed of the line segments O Aand AB (in this order). Let C2 denote the line segment OB Finally, let C3 denote the semicircular arc from Bto O. B C3 C2 C1 A Part (a) Find I f (z) dzand write it as a + ib where a and b are real numbers. What is a-b?

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