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If a,b,c denote the sides of triangleABC...

If a,b,c denote the sides of `triangleABC`, show that the value of the expression, `a^3 (p-q)(p-r)+b^2(q-r)+b^2(q-r)(q-p)+c^2(r-p)(r-q)` cannot be negative where `p,q,r in R`.

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The correct Answer is:
`=(ay-cz)^2 ge 0`
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