Just a quick question

1. Dec 5, 2008

dankelly08

how do you type in,

tan-1(-5/2) (or any negative number)

on the calculator?? or just work it out?

2. Dec 5, 2008

CompuChip

Are you talking about the (-5/2)? Most calculators have a separate key for that, which usually has something like "(-)" printed on it (a short dash in parentheses), rather than the normal (longer) minus sign "${}-{}$".

If you are referring to the -1: there should again be a separate key. On my TI calculator it is Second + Tan, just find where is says tan-1, atan, arctan, or something like that. Note that you should consider "tan-1" as a single function, it's not something like x-1 = 1/x, for which you can write in general x-n = 1/xn. Instead, it is defined by tan-1(tan(x)) = x.

3. Dec 5, 2008

dankelly08

Yeah I got it, thanks alot!! it was(+/-)

I spent a full hour trying to figure that out lol..