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2(a²+b²)= (a+b)²
2a² + 2b² = a²+2ab+b²
2a²-a²+2b²-b²-2ab=0
a²-2ab+b²= 0
(a-b)²=0
a-b=0
a= b
prove it..
2a² + 2b² = a²+2ab+b²
2a²-a²+2b²-b²-2ab=0
a²-2ab+b²= 0
(a-b)²=0
a-b=0
a= b
prove it..
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