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9. If a b = b c prove that (a+b+c) (a-b+c) = ( a ² +b ² +c ² ) |
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Answer» ( a2-2ab+b2) + (b2-2bc+C2) + (c2-2ca+a2) = 0 => (a-b)2+(b-c)2+(c-a)+(c-a)2 =0 |
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