if X+y=2 and x²+y²=2, what is the value of xy?
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x + y = 2
On squaring both sides , we get
x^2 + y^2 + 2xy = 4
=> 2 + 2xy = 4 [x^2 + y^2 = 2]
=> 2xy = 2
=> xy = 1
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