if X Y is equal to b and one upon X square + 1 upon y square is equal to a then X + y whole square equals to what
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answer is AB ^2
see the attached section
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xy= b
1/x sqaure +1/y sqaure = a
x sqaure + y sqaure a(xy)sqaure
(X +Y) whole sqaure = x sqaure + y sqaure + 2xy
=a(xy)sqaure + 2b
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