If xy = b and
1/x^2+ 1/y^2= a, then (x + y)^2? equals
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a+b
Step-by-step explanation:
1/b^2+1/b^2/2=1/2(a+b)^2-2ab=(a+b)^2/2-2ab/2=(a+b)^2/2-b
(a+b)^2/2=a+b
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