First off, I have been trying to do -2 times something, during law of cosines. But whenever I put a subtract sign first, it always put Ans in front of it, and it is so annoying how do I fix it? Also secondly,, I cannot divide by any negative numbers or when I use trig functions inverse I cannot use negative numbers, or else it says "synthrax error"???? I have a Texas Intstrument 30XIIS
Update: I click ans, and that subtracts as well, (without pressing 2nd), is that how I am always suppose to do it??? If so I feel dumb.