2 / 2 2\ |x|*\x - pi /
|x|*(x^2 - pi^2)^2
2 / 2 2\ / 2 2\ \x - pi / *sign(x) + 4*x*\x - pi /*|x|
/ 2 \ |/ 2 2\ / 2 2\ / 2 2\ | 2*\\x - pi / *DiracDelta(x) + 2*\- pi + 3*x /*|x| + 4*x*\x - pi /*sign(x)/
/ 2 \ |/ 2 2\ / 2 2\ / 2 2\ | 2*\\x - pi / *DiracDelta(x, 1) + 6*\- pi + 3*x /*sign(x) + 12*x*|x| + 12*x*\x - pi /*DiracDelta(x)/