Evaluate ∫exe2x+1dx\int \frac{e^x}{e^{2x}+1} dx∫e2x+1exdx.
arctan(ex)+C\arctan(e^x) + Carctan(ex)+C
ln(ex+1)+C\ln(e^x+1) + Cln(ex+1)+C
12arctan(ex)+C\frac{1}{2}\arctan(e^x) + C21arctan(ex)+C
ln(e2x+1)+C\ln(e^{2x}+1) + Cln(e2x+1)+C