मान ज्ञात कीजिए: $\tan^{-1}\left(\frac{1}{4}\right) + \tan^{-1}\left(\frac{2}{9}\right) = $

  • A
    $\frac{1}{2}\cos^{-1}\left(\frac{3}{5}\right)$
  • B
    $\frac{1}{2}\sin^{-1}\left(\frac{3}{5}\right)$
  • C
    $\frac{1}{2}\tan^{-1}\left(\frac{3}{5}\right)$
  • D
    इनमें से कोई नहीं

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