dx:X = [-20,0]


c:(X+1)*(X+2)*(X+3)*(X+4)*(X+5)*(X+6)*(X+7)*(X+8)*(X+9)*(X+10)*(X+11)*(X+12)*(X+13)*(X+14)*(X+15)*(X+16)*(X+17)*(X+18)*(X+19)*(X+20)+[0.11920928955078125e-6,0.11920928955078125e-6]*X^19 = 0
