함수 $\displaystyle F (s) = \frac{4} {\left (s^ {2} -2 s+5 \right) ^ {2}}$ 의 역변환 ${L} ^ {-1} \left \{F (s) \right \}$ 는?

• ①$\displaystyle e^ {-t} \frac{t \cos 2 t} {4}$
• ②$\displaystyle e^ {-t} \left (\frac{\cos 2 t} {2} - \frac{t \sin 2 t} {4} \right)$
• ③$\displaystyle e^ {t} \left (\frac{\sin 2 t} {4} - \frac{t \cos 2 t} {2} \right)$
• ④$e^ {t} (t \sin 2 t+ \cos 2 t)$