sin(26 + 56) - 2 sin26 × cos56
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
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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