Write (a+2b+c)whole square in expanded form
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a^+4b^+c^+4ab+4bc+2ac
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(a+2b+c)^2
= a^2 +4b^2 +c^2 + 4ab + 4bc +2ac
= a^2 +4b^2 +c^2 + 4ab + 4bc +2ac
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