Find the anti-derivative for $\displaystyle \int\frac{{2}}{{{4}+{36}{x}^{{2}}}}{\left.{d}{x}\right.}$ $\displaystyle =$ $\displaystyle +{C}$   Preview Question 6 Part 1 of 2  

Evaluate the definite integral $\displaystyle {\int_{{-\frac{{1}}{{3}}}}^{{\frac{{1}}{{3}}}}}\frac{{2}}{{{4}+{36}{x}^{{2}}}}{\left.{d}{x}\right.}$$\displaystyle =$ Preview Question 6 Part 2 of 2