Ok, so what is your question about MATLAB? A symbolic inverse will require a huge amount of memory. Are you looking for advice? DON'T DO IT. Find another way to solve your problem. The point is, you are going down a rabbit hole that will only get deeper.
Of course, we are not given sufficient information to know what you are doing, and why you think you need to compute this symbolic inverse. So better advice is hard to offer. There are often multiple ways to solve a problem. I'd suggest looking for an alternative approach. Leave the big brute force computation route as the last resort.
