मान लीजिए कि $f$ अंतराल $\left(0, \frac{\pi}{2}\right)$ में एक अवकलनीय फलन है। यदि $\int\limits_{\cos x}^{1} t^{2} f(t) d t = \sin^{3} x + \cos x - 1$ है,तो $\frac{1}{\sqrt{3}} f^{\prime}\left(\frac{1}{\sqrt{3}}\right)$ का मान ज्ञात कीजिए।

  • A
    $6 - 9\sqrt{2}$
  • B
    $\frac{9}{\sqrt{2}} - 6$
  • C
    $\frac{9}{2} - 6\sqrt{2}$
  • D
    $6 - \frac{9}{\sqrt{2}}$

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दिया गया है कि $\frac{d}{d x} \int_0^{\phi(x)} f(t) d t=f(\phi(x)) \phi^{\prime}(x)$. सभी $x \in \left(0, \frac{\pi}{2}\right)$ के लिए,यदि $\int_1^{\cos x} t^2 f(t) d t=\cos 2 x$ है,तो $f\left(\frac{1}{\sqrt{2}}\right)=$

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