Evaluate ∫1x2+1dx\int \frac{1}{x^2+1} dx∫x2+11dx.
arctan(x)+C\arctan(x) + Carctan(x)+C
ln∣x2+1∣+C\ln|x^2+1| + Cln∣x2+1∣+C
arccot(x)+C\text{arccot}(x) + Carccot(x)+C
−arctan(x)+C-\arctan(x) + C−arctan(x)+C