किन्ही दो सम्मिश्र संख्याएँ z 1 ...

किन्ही दो सम्मिश्र संख्याएँ ` z _ 1 ` तथा ` z _ 2 ` के लिए साबित कीजिये कि
` |z _ 1 + z _ 2 |^ 2 + | z _ 1 - z _ 2 |^ 2 = 2 [|z _ 1 |^ 2 + | z _ 2 |^ 2 ] `

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