यदि $2 \tan^{-1}(\cos x) = \tan^{-1}(2 \csc x)$ है,तो $\sin x + \cos x = $

  • A
    $2 \sqrt{2}$
  • B
    $\sqrt{2}$
  • C
    $\frac{1}{\sqrt{2}}$
  • D
    $\frac{1}{2}$

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