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" 8.If "a+b+c=5" and "ab+bc+ca=10" ,then...

" 8.If "a+b+c=5" and "ab+bc+ca=10" ,then prove that "a^(3)+b^(3)+c^(3)-3abc=-25

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If a+b+c=5 and ab+bc+ca=10, prove that a^3+b^3+c^3-3abc=-25

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