What is ∫dxx2+a2\int \frac{dx}{\sqrt{x^2+a^2}}∫x2+a2dx?
ln∣x+x2+a2∣+C\ln|x + \sqrt{x^2+a^2}| + Cln∣x+x2+a2∣+C
arcsin(x/a)+C\arcsin(x/a) + Carcsin(x/a)+C
1aarctan(x/a)+C\frac{1}{a}\arctan(x/a) + Ca1arctan(x/a)+C
None