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1. $\{{(x + y)}^{- 1} - (x - y) \times 2 y {(x^{2} - y^{2})}^{- 1}\}$

Answer: Option B

Explanation:

\{{(x + y)}^{- 1} - {(x - y)}^{- 1}\} \times 2 y {(x^{2} - y^{2})}^{- 1} \{\frac{1}{x + y} - \frac{1}{x - y}\} \times \frac{2 y}{x^{2} - y^{2}} \frac{x - y - x - y}{(x + y) (x - y)} \times \frac{2 y}{x^{2} - y^{2}} \frac{- 2 y}{x^{2} - y^{2}} \times \frac{2 y}{x^{2} - y^{2}} \frac{- 4 y^{2}}{{(x^{2} - y^{2})}^{2}}

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