Question

What is the simplified form of ?

Answer 1

$\cfrac{ \frac{1}{x}- \frac{1}{y} }{ \frac{1}{x} + \frac{1}{y} } = \cfrac{ \frac{y-x}{xy}}{ \frac{y+x}{xy}} = \cfrac{y-x}{xy} * \cfrac{xy}{y+x}= \cfrac{y-x}{y+x}$