यदि ${\sin ^{ - 1}}x + {\cot ^{ - 1}}\left( {\frac{1}{2}} \right) = \frac{\pi }{2}$ है,तो $x$ का मान ज्ञात कीजिए।

  • A
    $0$
  • B
    $\frac{1}{{\sqrt 5 }}$
  • C
    $\frac{2}{{\sqrt 5 }}$
  • D
    $\frac{{\sqrt 3 }}{2}$

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