factor (x**4/2+5*x**3/12-x**2/3)
solve(x**2*(2*x - 1)*(3*x + 4)/12, x)
diff(x**2*(2*x - 1)*(3*x + 4)/12, x)
series(x**2*(2*x - 1)*(3*x + 4)/12, x, 0, 10)
Need more control? Try SymPy Live.