$\cos ^{-1}\left(2 x^{2}-1\right)$ નું $\cos ^{-1} x$ ની સાપેક્ષમાં વિકલન શું થાય?

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

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