यदि $0 < |x| < \sqrt 2$ के लिए ${\sin ^{ - 1}}\left( {x - \frac{{{x^2}}}{2} + \frac{{{x^3}}}{4} - \dots} \right) + {\cos ^{ - 1}}\left( {{x^2} - \frac{{{x^4}}}{2} + \frac{{{x^6}}}{4} - \dots} \right) = \frac{\pi }{2}$ है,तो $x$ का मान ज्ञात कीजिए।

  • A
    $1/2$
  • B
    $1$
  • C
    $-1/2$
  • D
    $-1$

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