sin210° + sin150° =
= sin(180°+30°) + sin(180°-30°) =
= - sin30° + sin30° = 0
Ответ: 0
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sin210° + sin150° =
= sin(180°+30°) + sin(180°-30°) =
= - sin30° + sin30° = 0
Ответ: 0