748=468-432Cos(A) I got to this step in the law of Cosines but I forgot what to do next. I know I will have to use arc cos but I forgot how to set it up in a way to be able to do that.
minus 468 from both sides
then
divide both sides by -432
then you will have cosA by itself.
have a go at rearranging yourself and post with what you get :)
