Level:
Project ID:
1003230206
Accepted:
1
Clonable:
0
Easy:
0
Which of the statements A, B, C, D given bellow are incorrect?
\[
\begin{array}{l}
\text{A: }\left(\ln\frac x2\right)'=\frac1x,\ x\in\mathbb{R}^+ \\
\text{B: }\left(5\sin3x\right)'=5\cos3x \\
\text{C: }\left(\frac1{\left(x^3-1\right)^2}\right)'=\frac{-6x^2}{\left(x^3-1\right)^3},\ x\in\mathbb{R}\setminus\{1\} \\
\text{D: }\left(\ln(1+\cos x ) \right)'=\frac1{1-\sin x},\ x\neq\frac{\pi}2+2k\pi,\ k\in\mathbb{Z}
\end{array}\]
The only incorrect statements are:
B, D
A, B, D
B, C
B
A, C
A, C, D