Easy
$\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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