જો $xy = c^2$ હોય,જ્યાં $c$ અચળાંક છે,તો $\frac{dy}{dx}$ ની કિંમત કેટલી થાય?

  • A
    $\frac{x}{y}$
  • B
    $\frac{y}{x}$
  • C
    $\frac{-x}{y}$
  • D
    $\frac{-y}{x}$

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