Sin17П/6+cos240 Вычислите

Question

Sin17П/6+cos240
Вычислите

Answer 1

Sin17π/6 = Sin((3π- π/6) = -Sinπ/6 = -1/2
Cos240° = Cos(270° - 30°) = - Sin30° = -1/2
сам пример: -1/2 =1/2 = -1