Найти 6 sin150 градусов и cos150 градусов )

Лебедев Дмитрий Сергеевич

Учитель математики

Проверено учителем

Для нахождения значений тригонометрических функций угла 150° удобнее всего воспользоваться формулами приведения или тригонометрическим кругом. 1. Определение четверти и знаков Угол 150150 raised to the composed with power находится во второй четверти ( 90<150<18090 raised to the composed with power is less than 150 raised to the composed with power is less than 180 raised to the composed with power).

  • Синус во второй четверти положительный ( +positive). Косинус во второй четверти отрицательный ( negative).

2. Нахождение sin150sine 150 raised to the composed with power Воспользуемся формулой приведения sin(180α)=sinαsine open paren 180 raised to the composed with power minus alpha close paren equals sine alpha: sin150=sin(18030)=sin30sine 150 raised to the composed with power equals sine open paren 180 raised to the composed with power minus 30 raised to the composed with power close paren equals sine 30 raised to the composed with powerИз таблицы значений тригонометрических функций известно, что sin30=12sine 30 raised to the composed with power equals one-half . Теперь вычислим 6sin1506 sine 150 raised to the composed with power: 6sin150=612=36 center dot sine 150 raised to the composed with power equals 6 center dot one-half equals 3 3. Нахождение cos150cosine 150 raised to the composed with power Воспользуемся формулой приведения cos(180α)=cosαcosine open paren 180 raised to the composed with power minus alpha close paren equals negative cosine alpha: cos150=cos(18030)=cos30cosine 150 raised to the composed with power equals cosine open paren 180 raised to the composed with power minus 30 raised to the composed with power close paren equals negative cosine 30 raised to the composed with powerИз таблицы значений известно, что cos30=32cosine 30 raised to the composed with power equals the fraction with numerator the square root of 3 end-root and denominator 2 end-fraction . Следовательно: cos150=32cosine 150 raised to the composed with power equals negative the fraction with numerator the square root of 3 end-root and denominator 2 end-fraction Итоговый ответ:

  • 6sin150=36 sine 150 raised to the composed with power equals 3 cos150=32cosine 150 raised to the composed with power equals negative the fraction with numerator the square root of 3 end-root and denominator 2 end-fraction (или примерно -0,866negative 0 comma 866)

Хотите, чтобы я помог рассчитать значения для других углов или разобрал более сложное тригонометрическое выражение?

Форма ответа

Ваш аватар