Sin55° cos25° - cos55° sin25° делить sin12° cos18° - вопрос №55255525121812186230848 от ushelemet 29.10.2020 12:26

Question

Алгебра: Sin55° cos25° - cos55° sin25° делить sin12° cos18° - sin12° sin18°

ushelemet · Answer

Sin55° Cos25° - Cos55° Sin25°= Sin(55° - 25°) = Sin30° Сos12° Cos18° - Sin12° Sin18° = Cos(12° + 18°) = Cos30°наш пример:Sin30°/Cos30° = tg30° = 1/√3...