Factorise
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(x²+y²)
(a+b)²=a²+b²+2ab
(a+b)²-2ab=a²+b²
(x+y)²-2xy=x²+y²
(a+b)²=a²+b²+2ab
(a+b)²-2ab=a²+b²
(x+y)²-2xy=x²+y²
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