Consider a large expression which contains terms like
a/x+b/x^2+c x + d x^4 +...-b/x^2 +h x -a/x +...
I want to find limit of the expression when x goes to zero. Because the expression is very huge, using Limit[exp,x->0] doesn't help and takes very very large time. Then, I decided to put x=0 and print the value of expression, but it gives
1/0 error. It happens because Mathematica doesn't cancel terms like a/x and -a/x.
What is an efficient way to force MM to cancel these terms? I wanted to use simplify and then put x=0, but it also takes to much time for MM to simplify the expression. Could any one help me?