Whats wrong with my forumla? (Trig)
 

Say I have a point A at (1,3) and a point B at (2,1) and point B has an angle of 45 degrees. I need a formula that will tell me which direction (right or left) B should turn so it points at A the fastest. --(my attempt)-- I originally pretended that B was the center of a circle and A was on...