यदि $\int \frac{1}{\cos 4x \cos 2x} dx = \frac{1}{2\sqrt{2}} \log \left(\frac{1+f(x)}{1-f(x)}\right) - \frac{1}{2} \log g(x) + C$ है,तो $g\left(\frac{\pi}{6}\right) - \sqrt{2} f\left(\frac{\pi}{6}\right)$ का मान ज्ञात कीजिए।

  • A
    $\frac{\pi}{2\sqrt{2}}$
  • B
    $\pi+3$
  • C
    $2$
  • D
    $1$

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