4 (3*x - 2*x, n)
(3*x^4 - 2*x, n)
d / 4 \ --\(3*x - 2*x, n)/ dx
2 d / 4 \ ---\(3*x - 2*x, n)/ 2 dx
3 d / 4 \ ---\(3*x - 2*x, n)/ 3 dx