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सिद्ध कीजिए कि- |{:(a-b-c,2a,2a),(2b,b...

सिद्ध कीजिए कि-
`|{:(a-b-c,2a,2a),(2b,b-c-a,2b),(2c,2c,c-a-b):}|=(a+b+c)^(3)`

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