यदि $y = f\left( \frac{5x + 1}{10x^2 - 3} \right)$ और $f'(x) = \cos x$ है,तो $\frac{dy}{dx} = $

  • A
    $\cos \left( \frac{5x + 1}{10x^2 - 3} \right) \frac{d}{dx} \left( \frac{5x + 1}{10x^2 - 3} \right)$
  • B
    $\frac{5x + 1}{10x^2 - 3} \cos \left( \frac{5x + 1}{10x^2 - 3} \right)$
  • C
    $\cos \left( \frac{5x + 1}{10x^2 - 3} \right)$
  • D
    इनमें से कोई नहीं

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