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Mathematics, 29.01.2022 01:00 Ashwaf23474

If f (z) is a harmonic function of z, show that \bigg \{ \rm \dfrac{ \partial}{ \partial x} |f(z)| \bigg \}^{2} + \bigg \{ \dfrac{ \partial}{ \partial y} |f(z)| \bigg \}^{2} = |f'(z)|^{2}

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If f (z) is a harmonic function of z, show that
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