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सिद्ध कीजिए - |(b+c,a-b,a),(c+a,b-c,b...

सिद्ध कीजिए -
`|(b+c,a-b,a),(c+a,b-c,b),(a+b,c-a,c)|=3abc-a^3-b^3-c^3`

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