Evaluate the indefinite integral.

$$\int \frac{dx}{\sqrt{x^2 + 4 x + 13}}$$ = ${} + C$
[NOTE: Remember to enter all necessary *, (, and ) !!
Enter arctan(x) for $\tan^{-1} x$ , sin(x) for $\sin x$.... ]

(Note: Look at the page for hyperbolic functions available in WeBWorK.)