$\cos^{-1}(4x^3 - 3x)$ નું $\cos^{-1}(2x^2 - 1)$ ની સાપેક્ષ દ્વિતીય ક્રમનું વિકલિત, જ્યાં $\frac{1}{2} < x < 1$ છે, તે શું થશે?

  • A
    $0$
  • B
    $\frac{-1}{\sqrt{1 - x^2}}$
  • C
    $\frac{3}{2}$
  • D
    $\frac{-3}{2}$

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