यदि $\cos^{-1} \frac{3}{5} - \sin^{-1} \frac{4}{5} = \cos^{-1} x$ है,तो $x = $

  • A
    $0$
  • B
    $1$
  • C
    $-1$
  • D
    $2$

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$2 \cos ^{-1} x = \sin ^{-1} \left( 2 x \sqrt{1 - x^2} \right)$,$x$ के किन मानों के लिए मान्य है?

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