Not tangent
Calculus
Level
3
\[\large \displaystyle \lim _{ a\rightarrow 1 }{ \int _{ -a }^{ a }{ \frac { \sin( { \cos ^{ -1 }{ (x) } ) } }{ \cos ( \sin ^{ -1 } (x) ) } \, dx } } =?\]
by
Rui-Xian Siew