(a-b+c)²+(b-c+a)²+2(a-b+c)(b-c+a)
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(a-b+c)²+(b-c+a)²+2(a-b+c)(b-c+a)=(a-b+c+b-c+a)²=(2a)²=4a²
USING a²+b²+2ab=(a+b)²
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