∫﹙arctanx)^2/1+x^2dx

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∫﹙arctanx)^2/1+x^2dx
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∫﹙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