$\int \frac{1 - \tan x}{1 + \tan x} \, dx = $

  • A
    $\log \sec \left( \frac{\pi}{4} - x \right) + c$
  • B
    $\log \cos \left( \frac{\pi}{4} + x \right) + c$
  • C
    $\log \sin \left( \frac{\pi}{4} + x \right) + c$
  • D
    આમાંથી કોઈ નહીં

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