help with trig, good explanation

Question

Find the EXACT value of sin(A−B) if cos A = 3/5 where A is in Quadrant IV and cos B = 12/13 where B is in Quadrant IV. Assume all angles are measured from standard position. sin(A−B) =

Answer 1

Once you fix the problem discussed in the comments, use the same procedure that I discuss in your other similar problem---post a comment there if you have any questions