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किन्ही दो सम्मिश्र संख्याओं z(1) और z(2)...

किन्ही दो सम्मिश्र संख्याओं `z_(1)` और `z_(2)` के लिए, सिद्ध कीजिए :
`Re(z_(1) z_(2))=Re z_(1) Re z_(2)-Im z_(1) Im z_(2)`

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