यदि $y = b \cos \log \left( \frac{x}{n} \right)^n$ है,तो $\frac{dy}{dx} = $

  • A
    $- n \, b \sin \log \left( \frac{x}{n} \right)^n$
  • B
    $n \, b \sin \log \left( \frac{x}{n} \right)^n$
  • C
    $\frac{- nb}{x} \sin \log \left( \frac{x}{n} \right)^n$
  • D
    इनमें से कोई नहीं

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