1003230205

Which of the statements A, B, C given bellow are correct? \[ \begin{array}{l} \text{A: } \left(\frac{2x-1}{2-x}\right)'=\frac{5-4x}{(2-x)^2},\ x\neq2 \\ \text{B: } \left(\frac{\mathrm{e}^x-1}{x}\right)'=\frac{\mathrm{e}^x(x-1)-1}{x^2},\ x\neq0 \\ \text{C: } \left(\frac{\cos⁡ x}{1-\sin ⁡x}\right)'=\frac1{1-\sin ⁡x},\ x\neq\frac{\pi}2+2k\pi,\ k\in\mathbb{Z} \end{array}\] The only correct statements are: