$8\ln\left(x\right)-\frac{6}{x}+c$  

 $\ln\left(x\right)-6x+c$  

 $8\ln\left(x\right)-6x+c$  

 $\frac{\ln\left(x\right)}{8}-\frac{6}{x}+c$  

 $\ln\left|2x+\cos x\right|+c$  

 $\ln\left|x\right|-\ln\left|\cos x\right|+c$  

 $\ln\left|2-senx\right|+c$  

 $\ln\left|2x\right|-\ln\left|\cos x\right|+c$  

 $\ln\left|5+e^{2x}\right|+c$  

 $2\ln\left|5+e^{2x}\right|+c$  

 $\frac{1}{2}\ln\left|5+e^{2x}\right|+c$  

 $\frac{1}{2}\ln\left|e^{2x}\right|+c$  

 $\frac{1}{5}\ln\left|5+e^{2x}\right|+c$