(tan−1x)ln(1+x2)\left(\tan ^{-1} x\right) \ln \left(1+x^{2}\right)(tan−1x)ln(1+x2)
12(tan−1x)2\frac{1}{2}\left(\tan ^{-1} x\right)^{2}21(tan−1x)2
(12tan−1x)2\left(\frac{1}{2} \tan ^{-1} x\right)^{2}(21tan−1x)2
12tan−1x\frac{1}{2} \tan ^{-1} x21tan−1x
