જો $f(x) = \log(\sec x + \tan x)$ હોય,તો $f^{\prime}\left(\frac{\pi}{4}\right) = $

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

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