7.10. In polar coordinates z = r cos 0, y = r sin 0, the function f(z) = u(r, 0)+iv(r, 0). Show that the Cauchy-Riemann conditions can be written as (7.7) and ди Ər 1 əv T 00¹ f'(z) = 1 Ju T 00 e-i (ur +ivr). Əv Ər' (7.8)

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