%
irem()
[0] (x+2)^5 % 3; x^5+x^4+x^3+2*x^2+2*x+2 [1] (x-2)^5 % 3; x^5+2*x^4+x^3+x^2+2*x+1 [2] (-5) % 4; 3 [3] irem(-5,4); -1
idiv
irem