Hello
I have a very big and complex expression with variable x. There are different powers of this variable. I need the following thing. I specify the power of x (say, x^2) and write down all the coefficients belonging to x^2 in my expression. I am absolutely new in Mathematic?. So could you just give me corresponding links/references/advices so that I will read it and try?
P.S. To do this job on a sheet of paper is impossible. The expression is rather huge. It is very easy to make a mistake. After each recalculation I get different results...