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

सिद्ध कीजिए कि:
`|(-2a,a+b,a+c),(b+a,-2b,b+c),(c+a,c+b,-2c)|=4(b+c)(c+a)(a+b)`.

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