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सिद्ध कीजिये कि 2a^(2) + 2b^(2) +2c^(2...

सिद्ध कीजिये कि
`2a^(2) + 2b^(2) +2c^(2) - 2ab - 2bc - 2ca = (a-b)^(2) + (b-c)^(2) + (c-a)^(2)`

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