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(a + b + c)^2 = a^2 + b^2 + c^2 + 2ab + 2ac + 2bc.
(a + b + c)^2 = a^2 + b^2 + c^2 + 2ab + 2ac + 2bc.
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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