Solve the proof how (a+b+c)²= a²+b²c²+2ab+2bc+2
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(a+b+c)²=(a+b+c)(a+b+c)
=a(a+b+c)+b(a+b+c)+c(a+b+c)
=a²+ab+ac+ba+b²l+bc+ca+cb+c²
=a²+b²+c²+2ab+2bc+2ac
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