$\ln\left|2x\right|$ + C

 $\ln\left|x^2+1\right|$ + C

 $\frac{1}{\left(x^2+1\right)^2}$ + C

 $\frac{1}{2x}$  + C

A

B

both

neither

$-3\ln\left|\cos x\right|+2\cos x+C$

$-3\ln\left|\sin x\right|-2\sin x+C$

$-3\ln\left|\cos x\right|-2\cos x+C$

$3\ln\left|\cos x\right|-2\sin x+C$

 $\ln\left|2x\right|+c$  

 $\frac{1}{2}\ln\left|2x\right|+c$  

 $2\ln\left|2x\right|+c$  

 $2\ln\left|x\right|+c$  

 $\frac{1}{3}\ln\left|x^3+4\right|+c$  

 $\ln\left|x^3+4\right|+c$  

 $3\ln\left|x^3+4\right|+c$  

 $x^2\ln\left|x^3+4\right|+c$  

 $\ln\left|2-x\right|+c$  

 $\frac{1}{2}\ln\left|2-x\right|+c$  

 $2\ln\left|2-x\right|+c$  

 $-\ln\left|2-x\right|+c$