>> sind etc, and the inverse functions, are very welcome. (But as a student >> of hyperbolic geometry, I especially look forward to the hyperbolic >> functions and inverses!) > > Is this a jest, or would you actually use those functions? Hyperbolic > functions are not too hard, now that I have added a few tools to > manipulate extended precision numbers (basically, they're just a bunch > of sums and products on the result of the exponential function). > Their inverses are more tricky, and I can't promise them any time > soon. > > Regards, > Bruno > Half in jest -- and therefore half seriously. Of course I can easily form cosh, sinh etc out of exp but it would be nice to have them built-in. It would be good to check elaborate 'trigonometric' simplifications (does 'trigonometric' apply to hyperbolic functions?) at general values of variables rather than values specially chosen to ease the calculations. Andrew