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