Question

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Answer 1

1/(x-y)-1/(x+y)=(x+y-x+y)/(x²-y²)=2y/(x²-y²)
2)2y/(x²-y²)*(x²-y²)/y²=2/y

Answer 2

$frac{1}{(x-y)}- frac{1}{(x+y)}= frac{x+y-x+y}{( x^{2} - y^{2}) }= frac{2y}{ x^{2} - y^{2} }$
2) $frac{2y}{( x^{2} - y^{2} }* frac{( x^{2} - y^{2}) }{ y^{2} }= frac{2}{y}$