differentiation

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



1) $4({x^2} + \cos x)(2x - \sin x)$
2) $4{({x^2} - \cos x)^3}(2x - \sin x)$
3) $4{({x^2} + \cos x)^3}(2x - \sin x)$
4) $4{({x^2} + \cos x)^3}(2x + \sin x)$
Solution: Explanation: Explanation
standard-differentiation

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