For any math student, of any level (well, at least pre-calc or higher), this is a must download.
This program has several Trig functions, a couple Calc functions, and several Algebra functions.
This APP has a simplification feature, which is very cool. It can make simplifying equations extremely easy (almost too easy :) ). It has derivative features for calculus students (and there pretty cool).
The trig functions are nice for pre-calc students. It can calculate CSC (cosecent), SEC (secent), and COT (cotangent). Although, 1/sin(x)=csc(x), 1/cos(x)=sec(x), and 1/tan(x)=cot(x) so it's not really necessary (and it's slower using symbolic, by the way).
Although, Symbolic also has Omnicalc's wierd token problem with OS 1.15 or later. I recommend 1.14 for the best results.
As for compatability, Symbolic 1.8 is fully compatable with Omnicalc. In fact, if you have Symbolic on the calculator (but not installed), Omnicalc will automatically install it when you install Omnicalc :) .
Good News: Simplification, Simplification, and Simplification. (Oh and trig as well, can't forget trig).
Bad News: Has Omnicalc's wierd token problems. Some trig functions can be done without Symbolic. No nice Online help like Omnicalc does (but there is some).