यदि $I_n = \int \cos^n x \, dx$ है, तो $6 I_6 - 5 I_4 = $

  • A
    $-\cos^5 x \sin^2 x$
  • B
    $\cos^6 x \sin^2 x$
  • C
    $\cos^3 x \sin^2 x$
  • D
    $\cos^5 x \sin x$

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