ab+bc+ca whole square
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7
Answer:
(ab*ab ) +(bc *bc) +(ca *ca) + 2ab*bc+2bc*ca+2ca*ab.
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11
(a+b+c)²= a²+b²+c²+2ab+2bc+2ca
(ab+bc+ca) ² = ab²+bc²+ca² + 2ab²c + 2bc²a + 2ca²b
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