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यदि x=(2+sqrt(5))^(1//2)+(2-sqrt(5))^(1/...

यदि `x=(2+sqrt(5))^(1//2)+(2-sqrt(5))^(1//2)` व `y=(2+sqrt(5))^(1//2)-(2-sqrt(5))^(1//2)` तब सिद्ध कीजिए कि `x^(2)+y^(2)=8`

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