1.

What is the answer of ( frac{x^2+y^2+2xy}{x^2-y^2} )?

A. (x y) (x + y)<sup>-2</sup>
B. (x + y) (x y)<sup>-2</sup>
C. (x + y) (x y)<sup>-1</sup>
D. (x y) (x + y)<sup>-1</sup>
Answer» D. (x y) (x + y)<sup>-1</sup>


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