$\frac{d}{dx}({x^2} + \cos x)^4 = $

  • A
    $4({x^2} + \cos x)(2x - \sin x)$
  • B
    $4({x^2} - \cos x)^3(2x - \sin x)$
  • C
    $4({x^2} + \cos x)^3(2x - \sin x)$
  • D
    $4({x^2} + \cos x)^3(2x + \sin x)$

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