While the polynomial parsing and evaluation works well for polynomials without parentheses, they don't work well with polynomials such as $(4x-3)^3$

Optimally, there should be some function that expands the equation $(4x-3)^3 \rightarrow 64x^3-144x^2+108x-27$

I'm thinking that this polynomial expansion function can be added to the simple polynomial parser, extended polynomial parser, and the ast polynomial parser