यदि $(\sin ^{-1} x)^{2}-(\cos ^{-1} x)^{2}=a ; 0 < x < 1, a \neq 0$ है,तो $2 x^{2}-1$ का मान क्या है?

  • A
    $\cos \left(\frac{4 a}{\pi}\right)$
  • B
    $\sin \left(\frac{2 a}{\pi}\right)$
  • C
    $\cos \left(\frac{2 a}{\pi}\right)$
  • D
    $\sin \left(\frac{4 a}{\pi}\right)$

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