A square + B square equal is
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(a+b)²=a²+b²+2ab
then,a²+b²=(a+b)²-2ab.
or
(a-b)²=a²+b²-2ab
then, a²+b²=(a-b)²+2ab
then,a²+b²=(a+b)²-2ab.
or
(a-b)²=a²+b²-2ab
then, a²+b²=(a-b)²+2ab
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