> > sin^2(x) > > Um, try (sin(x))^2. Well, thanks :-) I know how to enter it to the calculator - I wasn't mentioning syntax errors, was I ? I wrote sin^2(x) because that's how a textbook would write it (at least the ones I read :-): 2 sin x and I was talking about a trivial algebraic transformation, not actual numeric calculation. Regards, Zoltan