यदि $\sin (\cot ^{ - 1}(x + 1)) = \cos (\tan ^{ - 1}x)$ है,तो $x =$

  • A
    $ - \frac{1}{2}$
  • B
    $\frac{1}{2}$
  • C
    $0$
  • D
    $\frac{9}{4}$

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