This stems from a calculus problem, and I have no trouble with the calculus I only am having trouble in reducing the polynomial into a simplified form.

I am doing differentiations; the polynomial I end up with is

4[(4-3x^3)^3](-9x^2)(1-2x)^6+(4-3x^3)^4[6(1-2x)^5](-2)

and the reduced answer is the following but I don't know how to reduce it to that

12[(4-3x^3)^3][(1-2x)^5][(9x^3)(-3x^2)-4]

any help is appreciated.