यदि $I_n = \int \sin^n x \, dx$ है, तो $n I_n - (n-1) I_{n-2}$ का मान क्या होगा?

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

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