(a+b+c)² = (a+b+c)(a+b+c)
= a²+ab+ac+ba+b²+bc+ca+cb+c²
= a²+b²+c²+2ab+2ac+2bc
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(a+b+c)² = (a+b+c)(a+b+c)
= a²+ab+ac+ba+b²+bc+ca+cb+c²
= a²+b²+c²+2ab+2ac+2bc