Найдите значание выражения:sin(150-a)+sin(150-а)
sin(150-a)+sin(150-а)=2sin(150-a)=2sin(180-(30+a))=2sin(30+a)=
=2(sin30cosa+cos30sina)=2(1/2*cosa+\sqrt{3}/2*sina)=cosa+\sqrt{3}*sina
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sin(150-a)+sin(150-а)=2sin(150-a)=2sin(180-(30+a))=2sin(30+a)=
=2(sin30cosa+cos30sina)=2(1/2*cosa+\sqrt{3}/2*sina)=cosa+\sqrt{3}*sina