(а+b)²-(a-b)(a+b)=(а²+2ab+b²)-(а²-b²)=а²+2ab+b²-a²+b²=2ab+2b²
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(а+b)²-(a-b)(a+b)=(а²+2ab+b²)-(а²-b²)=а²+2ab+b²-a²+b²=2ab+2b²