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यदि x = (2 + √5)1/2 + (2 - √5)1/2 व y = (2 + √5)1/2 - (2 - √5)1/2 तब सिद्ध कीजिये कि x2 + y2 = 8

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 = 2[(2 + √5) + (2 - √5)] = 2(4) = 8

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