Determine the integral ∫11+x2dx\int \frac{1}{1+x^2} dx∫1+x21dx.
ln(1+x2)+C\ln(1+x^2) + Cln(1+x2)+C
tan−1(x)+C\tan^{-1}(x) + Ctan−1(x)+C
sin−1(x)+C\sin^{-1}(x) + Csin−1(x)+C
12tan−1(x)+C\frac{1}{2} \tan^{-1}(x) + C21tan−1(x)+C