극한 $\displaystyle \lim _ {x \rightarrow 0} \frac{2 \ln (\cos x) +x^ {2}} {x^ {4}}$ 을 구하면?

• ①$\displaystyle - \frac{1} {6}$
• ②$\displaystyle - \frac{1} {12}$
• ③$\displaystyle \frac{1} {12}$
• ④$\displaystyle \frac{1} {6}$
• ⑤$\infty$