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सिद्ध करो कि : (x+y)^(3)+(y+z)^(3)+(...

सिद्ध करो कि :
`(x+y)^(3)+(y+z)^(3)+(z+x)^(3)-3(x+y)(y+z)(z+x)=2(x^(3)+y^(3)+z^(3)-3xyz)`

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