sin(26 + 56) - 2 sin26 × cos56

Question

sin(26 + 56) - 2 sin26 × cos56

Answer 1

sin(26+56) - 2 sin26*cos56

sin26*cos56 + cos26*sin56 - 2 sin26*cos56

cos 26*sin56 - sin 26*cos56

sin(26-56)= sin (-30)=1\2