/|x| \ x*|--- - 1| \ x /
x*(|x|/x - 1)
/sign(x) |x|\ |x| -1 + x*|------- - ---| + --- | x 2| x \ x /
2*DiracDelta(x)
/ /|x| sign(x) \ \ | 3*|--- - ------- + DiracDelta(x)| | | | 2 x | | | 3*DiracDelta(x) 3*|x| \ x / 3*sign(x) | 2*|- --------------- - ----- + --------------------------------- + --------- + DiracDelta(x, 1)| | x 3 x 2 | \ x x /