expand (a+b+c)^2
fast solve plz
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(a+b+c)²
= {(a+b)+c}²
= (a+b)² + 2(a+b).c +c²
= a²+2ab + b² + 2ac + 2bc + c²
=a² + b² + c² + 2(ab+bc+ac)
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Refer the attachment
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