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सिद्ध करे कि |{:(3a,b-a,c-a),(a-b,3b,c-...

सिद्ध करे कि ` |{:(3a,b-a,c-a),(a-b,3b,c-b),(a-c,b-c,3c):}|= 2 (a+b+c) (ab+bc+ca)`

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