$\cot ^{-1}\left(\frac{1}{\sqrt{x^2-1}}\right)=$ . . . . . . जहाँ,$x>1$.

  • A
    $\sec ^{-1} x$
  • B
    $\sin ^{-1} x$
  • C
    $\operatorname{cosec}^{-1} x$
  • D
    $\cos ^{-1} x$

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यदि $x>0, y>0, z>0, xy+yz+zx < 1$ और यदि $\tan^{-1} x + \tan^{-1} y + \tan^{-1} z = \pi$ है, तो $x+y+z$ का मान क्या होगा?

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