Mathematics

Problem

x = \theta - \frac{1}{\theta}

and

y = \theta + \frac{1}{\theta}

, then

\frac{dy}{dx} =

(A)

\frac{x}{y}

(B)

\frac{y}{x}

(C)

\frac{-x}{y}

(D)

\frac{-y}{x}