Let a function f(z) = u + iv be differentiable at a nonzero point z0 = r0
Question:
f'(z0) = ux + ivx
in Sec. 22 as
f'(z0) = e−iθ(ur + ivr),
where ur and vr are to be evaluated at (r0, θ0).
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Related Book For
Complex Variables and Applications
ISBN: 978-0073051949
8th edition
Authors: James Brown, Ruel Churchill
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