∫﹙arctanx)^2／1+x^2dx

∫﹙arctanx)^2／1+x^2dx
∫﹙arctanx)^2／1+x^2dx

∫﹙arctanx)^2／1+x^2dx
∫﹙arctanx)^2／1+x^2dx
=∫﹙arctanx)^2darctanx
=(arctanx)^3/3+C