/ ________\ | / 2 | acos\\/ 1 - x /
acos(sqrt(1 - x^2))
x --------------- ________ / 2 \/ 1 - x *|x|
2 1 sign(x) x --- - ------- + ------------ |x| x / 2\ \1 - x /*|x| ---------------------------- ________ / 2 \/ 1 - x
3 2*DiracDelta(x) 2*sign(x) 3*x 3*x - --------------- - --------- + ------------ + ------------- x 2 / 2\ 2 1 - x \1 - x /*|x| / 2\ \1 - x / *|x| ------------------------------------------------------------ ________ / 2 \/ 1 - x