"Michael S. Davis" wrote:
> I use MathLib for Trig functions. Sin and Tan seem to work fine. But
> Cos has a quirk. cos(0)=1 but cos(90)=2.8328e-16. Now I know that is
> headed toward zero but it's not zero. I have looked at many Palm
> calculator applications and find that this is consistent on every calc
> that I have tested. One reports cos(90) as 6.123e-17 another 2.8328e-16
> one with 8.9e-15. I did find one that reported zero.
i just checked parens (uses mathlib) and it said
cos(90)=-1.60812264968e-16, but when i do cos(89.9999999999999)=0
that is 13 9s after 89, no more no less. maybe you could subtract
.0000000000001 before sending it to the mathlib. it works in parens.
of course tan works wrong in parens.
who knows?
:p
