Cambridge Org
2 cos(x y) cos(x y) sinxcosy= 1 2 sin(x y) sin(x y) SumtoProduct Formulas sinx siny= 2sin xy 2 cos x y 2 sinx siny= 2sin x y 2 cos xy 2 cosx cosy= 2cos xy 2 cos x y 2 cosx cosy= 2sin xy 2 sin x y 2 The Law of Sines sinA a = sinB b = sinC c Suppose you are given two sides, a;band the angle Aopposite the side A TheGet stepbystep solutions from expert tutors as fast as 1530 minutes