$\int \cos^{-1}(2x^2-1) \, dx =$

  • A
    $2(x \sin^{-1} x + \sqrt{1-x^2}) + c$
  • B
    $2(x \cos^{-1} x + \sqrt{1-x^2}) + c$
  • C
    $2(x \cos^{-1} x - \sqrt{1-x^2}) + c$
  • D
    $2(x \sin^{-1} x - \sqrt{1-x^2}) + c$

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