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"If "f(x)=|{:(x+a^(2),ab,ac),(ab, x+b^(2...

`"If "f(x)=|{:(x+a^(2),ab,ac),(ab, x+b^(2),bc),(ac,bc, x+c^(2)):}|," then prove that "`
`f'(x)=3x^(2)+2x(a^(2)+b^(2)+c^(2))`.

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