sign(x) 2*|x| ------- - ----- 2 3 x x
/ 2*sign(x) 3*|x| \ 2*|- --------- + ----- + DiracDelta(x)| | x 2 | \ x / --------------------------------------- 2 x
/ 12*|x| 6*DiracDelta(x) 9*sign(x) \ 2*|- ------ - --------------- + --------- + DiracDelta(x, 1)| | 3 x 2 | \ x x / ------------------------------------------------------------- 2 x