Exercise calculus.differentiation.quotient

Description
Use the quotient-rule to find the derivative of a polynomial. Only remove parentheses in the numerator.

Derivation

Final term is not finished
((2*x^3+4)*D(x) (3*x^2)-3*x^2*D(x) (2*x^3+4))/(4*x^6+16*x^3+16)