> I guess you could write a program to solve some huge problem. But in the > end, that would probably take more time than just solving the problem by > hand. I found a basic transformation that the TI89 misses in about 2 hours of initial playing with it ... sin^2(x) or cos^2(x). If it doesn't know *that* one, then it shouldn't be that hard to find quite a few others. Regards, Zoltan