|x|*sin(pi*x)
sign(x)*sin(pi*x) + pi*|x|*cos(pi*x)
2 2*DiracDelta(x)*sin(pi*x) - pi *|x|*sin(pi*x) + 2*pi*cos(pi*x)*sign(x)
3 2 2*DiracDelta(x, 1)*sin(pi*x) - pi *|x|*cos(pi*x) - 3*pi *sign(x)*sin(pi*x) + 6*pi*DiracDelta(x)*cos(pi*x)