$\cos ^{ - 1}\frac{4}{5} + \tan ^{ - 1}\frac{3}{5} = $

  • A
    $\tan ^{ - 1}\frac{27}{11}$
  • B
    $\sin ^{ - 1}\frac{11}{27}$
  • C
    $\cos ^{ - 1}\frac{11}{27}$
  • D
    इनमें से कोई नहीं

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यदि $\tan ^{-1}x + \tan ^{-1}y + \tan ^{-1}z = \frac{\pi }{2}$ है,तो

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