Is there any way to force a Ti-89 to output a decimal approximation as opposed to outputting a fraction? I’ve looked through all the menus, but I can’t find anythign that would help me do this.
Also, is there any way to put cscx, secx, or cotx into the main screen other than having to use 1/trig equivalent?
Thanks for the help.
A floating-point decimal value is called APPROXIMATE as opposed to an EXACT fraction. You can set it to always show APPROX values by pressing the MODE button and scrolling down to Exact/Approx. You can also set it to a third option, called AUTO, which is what I use. This will give you an APPROX value if any of the input is decimal, but EXACT if it can. For instance:
7/14 ENTER will give you 1/2, but
7./14 ENTER will give you 0.5.
You can also force a single calculation to show up as APPROX by pressing the Green Diamond then Enter. See pages 49-51 of your manual for more information.
The TI-89 does not have a built-in sec function, but you can easily write one. The example on page 65 in fact shows you how to make the sec function specifically. Then to call this function you can type in the letters s-e-c-(, or put it on your Custom Menu. See pages 291-292 for instructions on how to set up your Custom Menu.
Just wanted to pipe in and say I had this same exact problem with my 89.
Should we Hijack this thread to 89 Games?