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Which of the statements A, B, C, D given bellow are incorrect? $$\begin{array}{l}\text{A: }{(\ln \frac{x}{2})}^{\prime }=\frac{1}{x},x\in {\mathbb{R}}^{+}\\ \text{B: }{(5\sin 3x)}^{\prime }=5\cos 3x\\ \text{C: }{\left(\frac{1}{{(x^3-1)}^2}\right)}^{\prime }=\frac{-6x^2}{{(x^3-1)}^3},x\in \mathbb{R}\setminus \{1\}\\ \text{D: }{(\ln (1+\cos x))}^{\prime }=\frac{1}{1-\sin x},x\ne \frac{\pi }{2}+2k\pi ,k\in \mathbb{Z}\end{array}$$ The only incorrect statements are: