Correct Answer: Option A

Explanation

Simplify (\(\frac{1}{x^{-1}} \div \frac{1}{y^{-1}}\))-1 = (\(\frac{1}{x^{-1}} \div \frac{1}{y^{-1}}\))-1

=  \((x \div y)^{-1}\) = \(\frac{(x^{-1})}{y^{-1}}\)

= \(\frac{y}{x}\)

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