I really didn't mean that. I have a long polynomial with many terms which the degree of the polynomial is foe exdample 234.

It is very time saving to reduce the unwanted terms and I don't know how.

maybe I should not do tha but the MAPLE can not plot such a function with 10 or more pages of terms.

do you exactly consider what i mean?

It means a function U(x,y) which is the answer to the problem.

yes I mean that. how could I derive a function for it, using maple?