यदि $f(x) = (\cos x)(\cos 2x) \ldots (\cos nx)$ है, तो $f^{\prime}(x) + \sum_{r=1}^n (r \tan rx) f(x)$ का मान ज्ञात कीजिए।

  • A
    $f(x)$
  • B
    $0$
  • C
    $-f(x)$
  • D
    $2f(x)$

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यदि $y = x^2 + \frac{1}{x^2 + \frac{1}{x^2 + \frac{1}{x^2 + \dots \infty}}}$ है,तो $\frac{dy}{dx}$ का मान ज्ञात कीजिए।

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यदि $(x e)^{y}=e^{x}$ है,तो $\frac{d y}{d x}$ है

यदि $\sin (x+y)+\cos (x+y)=\sin \left[\cos ^{-1}\left(\frac{1}{3}\right)\right]$ है,तो $\frac{d y}{d x}=$

मान लीजिए $f : (0, \infty) \rightarrow (0, \infty)$ एक अवकलनीय फलन है,जहाँ $f(1) = e$ और $\lim_{t \rightarrow x} \frac{t^{2} f^{2}(x) - x^{2} f^{2}(t)}{t - x} = 0$ है। यदि $f(x) = 1$ है,तो $x$ का मान ज्ञात कीजिए।

यदि $x=\sqrt{1-\tan y}$ है, तो $\frac{dy}{dx}=$

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