यदि $\int \left\{ \cos^{-1} x - (1-x^2)^{-\frac{1}{2}} \right\} k \, dx = k \cdot \cos^{-1} x + c$ है,तो $k = $ . . . . . . .

  • A
    $e^{\cos^{-1} x}$
  • B
    $e^x$
  • C
    $e^{-x}$
  • D
    $-e^x$

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