Evaluate ∫dxx2+9\int \frac{dx}{x^2+9}∫x2+9dx.
13arctan(x/3)+C\frac{1}{3}\arctan(x/3) + C31arctan(x/3)+C
arctan(x/3)+C\arctan(x/3) + Carctan(x/3)+C
19arctan(x)+C\frac{1}{9}\arctan(x) + C91arctan(x)+C
None