Complex Numbers Q5

Complex Numbers Q5

Given that \({z}\) and \({w}\) are complex numbers, prove that

\({{{\left| z+w \right|}^{2}}-{{\left| z+w^{*}\right|}^{2}}=4 \, \mathrm{Im}\, z}\) \({\mathrm{Im}\, w}\),

where \({w^*}\) denotes the complex conjugate of \({w}\).

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