Геометрия, 8 класс. Помогите, пожалуйста..

Геометрия, 8 класс. Помогите, пожалуйста..

Для нахождения других тригонометрических значений угла а (альфа) можно использовать следующие формулы:

1. Косинус а (cos a) = 1 / √(1 + tg^2 a)
2. Синус а (sin a) = tg a * cos a
3. Котангенс а (ctg a) = 1 / tg a
4. Секанс а (sec a) = 1 / cos a
5. Косеканс а (cosec a) = 1 / sin a

Используя значение тангенса а (tg a = 2/7), мы можем найти остальные значения:

1. Косинус а (cos a) = 1 / √(1 + (2/7)^2) = 1 / √(1 + 4/49) = 1 / √(53/49) = 1 / (√53 / 7) = 7 / √53 = 7√53 / 53
2. Синус а (sin a) = (2/7) * (7√53 / 53) = 2√53 / 53
3. Котангенс а (ctg a) = 1 / (2/7) = 7/2
4. Секанс а (sec a) = 1 / (7√53 / 53) = 53 / (7√53) = 53√53 / 53 = √53
5. Косеканс а (cosec a) = 1 / (2√53 / 53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) = 53 / (2√53) =