$\displaystyle \lim _ {x \rightarrow 1} \frac{x^ {x} -1} {x^ {2} +x-2}$ 의 값은?

• ①$1$
• ②$\displaystyle \frac{1} {2}$
• ③$\displaystyle \frac{1} {3}$
• ④$\displaystyle \frac{1} {4}$
• ⑤$\displaystyle \frac{1} {5}$