1 1*------- ____ / 2 \/ x
d / 1 \ --|1*-------| dx| ____| | / 2 | \ \/ x /
-1 ----- x*|x|
1 sign(x) --- + ------- |x| x ------------- 2 x
/ 1 2*sign(x)\ -2*|--- - DiracDelta(x) + ---------| \|x| x / ------------------------------------ 3 x