For all distinct nonzero values of \(x\) and \(y\), which of the following expressions is equivalent to \( \displaystyle \frac{\frac{x}{y}-1}{\frac{1}{y}-\frac{1}{x}}\) ?
For all distinct nonzero values of \(x\) and \(y\), which of the following expressions is equivalent to \( \displaystyle \frac{\frac{x}{y}-1}{\frac{1}{y}-\frac{1}{x}}\) ?