Evaluate ∫1x2+a2dx\int \frac{1}{x^2 + a^2} dx∫x2+a21dx.
1aarctan(x/a)+C\frac{1}{a} \arctan(x/a) + Ca1arctan(x/a)+C
arctan(x/a)+C\arctan(x/a) + Carctan(x/a)+C
1a2arctan(x)+C\frac{1}{a^2} \arctan(x) + Ca21arctan(x)+C
ln(x2+a2)+C\ln(x^2 + a^2) + Cln(x2+a2)+C