ધારો કે $f(x) = \frac{\sin x + \cos x - \sqrt{2}}{\sin x - \cos x}$,$x \in [0, \pi] - \{\frac{\pi}{4}\}$. તો $f(\frac{7\pi}{12}) f''(\frac{7\pi}{12})$ ની કિંમત શોધો.

  • A
    $\frac{-2}{3}$
  • B
    $\frac{2}{9}$
  • C
    $-\frac{1}{3\sqrt{3}}$
  • D
    $\frac{-2}{3\sqrt{3}}$

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