Question: From results obtained in Secs. 21 and 22, determine where f'(z) exists and find its value when (a) f (z) = 1/z; (b) f (z)

From results obtained in Secs. 21 and 22, determine where f'(z) exists and find its value when
(a) f (z) = 1/z;
(b) f (z) = x2 + iy2;
(c) f (z) = z Im z.

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