આપેલ છે કે $\frac{d}{d x} \int_0^{\phi(x)} f(t) d t=f(\phi(x)) \phi^{\prime}(x)$. બધા $x \in \left(0, \frac{\pi}{2}\right)$ માટે,જો $\int_1^{\cos x} t^2 f(t) d t=\cos 2 x$ હોય,તો $f\left(\frac{1}{\sqrt{2}}\right)=$

  • A
    $2 \sqrt{2}$
  • B
    $4 \sqrt{2}$
  • C
    $\frac{\pi}{4}$
  • D
    $\frac{-\pi}{4}$

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