$\frac{d}{dx}[\sin^n x \cos nx] = $

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

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