यदि $\pi \le x \le 2\pi $ है,तो ${\cos ^{ - 1}}(\cos x)$ किसके बराबर है?

  • A
    $x$
  • B
    $-x$
  • C
    $2\pi + x$
  • D
    $2\pi - x$

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यदि $\sin ^{-1}\left(\frac{x}{13}\right)+\operatorname{cosec}^{-1}\left(\frac{13}{12}\right)=\frac{\pi}{2}$ है,तो $x$ का मान ज्ञात कीजिए।

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