यदि $I_n = \int \frac{\sin nx}{\cos x} dx$ है,तो $I_n =$

  • A
    $\frac{-2}{n-1} \cos (n-1)x - I_{n-2}$
  • B
    $\frac{2}{n-1} \cos (n-1)x + I_{n-2}$
  • C
    $\frac{-2}{n+1} \sin (n+1)x - I_{n-2}$
  • D
    $\frac{-2}{n+1} \cos (n-1)x - I_{n-2}$

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