Hello, I am new to the TI-Titanium and have run into a few rather simple obstacles that are keeping me from answering physics questions in the correct way. First off, by typing: \sqrt(5) the answer comes out to: =\sqrt(5) as opposed to 2.2360... (I believe this is a setting/mode issue) Secondly, I have a simple trig function: tanθ=2/1 to solve, I typed: tan-1(2/1) as one would do and the result was: (-90*(((tan-1(1/2)-pi)/90)-pi)/pi Now this answer seems to be in radians, and so I changed the setting to degrees..still I get this same answer. The actual textbook answer was: θ=63.4° Why is this happening? If anyone could tell me what it is I have to do in order for my TI-89 to answer these problems in the way I'd like them to be answered I would greatly appreciate it! Thanks in advance!