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For any two complex numbers z1 and z2, prove that Re (z1 z2) = Re z1 Re z2 – Imz1 Imz2

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For any two complex numbers z1 and z2, prove that Re (z1 z2) = Re z1 Re z2 – Imz1 Imz2

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To prove Re (z1 z2) = Re z1 Re z2 – Imz1Imz2

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