(a+b)²-(a-c)²=(a+b-(a-c))·(a+b+(a-c))=(a+b-a+c)·(a+b+a-c)=(b+c)·(2a+b-c)
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(a+b)²-(a-c)²=(a+b-(a-c))·(a+b+(a-c))=(a+b-a+c)·(a+b+a-c)=(b+c)·(2a+b-c)