Question:`x/(x + y) + y/(x - y) + 1/(x^2 - y^2)` 

A `(x^2 + y^2 + 1)/(x^2 - y^2)` 
B `(x^2 - y^2 + 1)/(x^2 - y^2)` 
C `(x^2 + y^2 - 1)/(x^2 - y^2)` 
D `(x + y + 1)/(x^2 - y^2)` 

+ Answer
A 

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Irin Moni

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