यदि $n$ एक धनात्मक पूर्णांक है जो $1$ से बड़ा है और $I_{n}=\int \frac{\sin n x}{\sin x} d x$ है, तो $I_{n+1}-I_{n-1}=$

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

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