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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