Thread: Trig functions on TI-89 Titanium

Hey guys,

I have a problem with my TI-89 titanium. I'm currently doing some trig functions and the answer to some of the equations are
looking quite strange to me. For instance, if i plug in:

cos(x)=0.516,x in solve,

I get this:

2·@n9·π+1,02862...

Rather than a number. Does anyone know what the problem is?
Any help much appreciated!

go to the link, play the video ...

Section 13: Solving Trigonometric Equations(TI-89)

Thank you Made sense