정적분 $\displaystyle \int _ {-1} ^ {1} {\left (e^ {x^3} -e^ {- x^3} \right) dx}$ 의 값은?

• ①$\displaystyle \sqrt[3]{e} - \frac{1} {\sqrt[3]{e}}$
• ②$\displaystyle e- \frac{1} {e}$
• ③$0$
• ④$\displaystyle e+ \frac{1} {e}$
• ⑤$\displaystyle \sqrt[3]{e} + \frac{1} {\sqrt[3]{e}}$