Question: Show that when f(z) = x3 + i(1 y)3, it is legitimate to write f'(z) = ux + ivx = 3x2 only when z

Show that when f(z) = x3 + i(1 − y)3, it is legitimate to write
f'(z) = ux + ivx = 3x2
only when z = i.

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