$\displaystyle \int _ {0} ^ {1} {\ln} \left (1+x^ {2} \right) d x$ 의 값은?

• ①$\displaystyle {\ln} 2-2+ \frac{\pi} {2}$
• ②${\ln} 2-2+ \pi$
• ③${\ln} 2+2- \pi$
• ④$\displaystyle {\ln} 2+2- \frac{\pi} {2}$