∫(arctanx)^2/(1+x^2)dx=

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

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

∫(arctanx)^2/(1+x^2)dx=
∫(arctanx)^2/(1+x^2)dx=
=∫(arctanx)^2d(arctanx)
=1/3 (arctanx)^3 +c