$\cos^{-1}\left(\frac{15}{17}\right) + 2\tan^{-1}\left(\frac{1}{5}\right) = $

  • A
    $\frac{\pi}{2}$
  • B
    $\cos^{-1}\left(\frac{171}{221}\right)$
  • C
    $\frac{\pi}{4}$
  • D
    इनमें से कोई नहीं

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