Предмет: Алгебра, автор: sevastianovaa3

Очень срочно!!!!!!!!

Приложения:

Ответы

Автор ответа: abriutin
0

Ответ:

2,4

Объяснение:

sin 2x = 2 sinx · cos x

1) cos х = - √(1- sin²x) = -(√(1-(-2/5)²) = -(√ (1 - 0,16) = - √0,84

2) sin 2x = 2 sinx · cos x = 2 · (-0,4) · (- √0,84) = 2 · 0,4 · 0,9165 ≈ 0,7

3) 0,7 + 1,7 = 2,4

Ответ: 2,4

Предыдущий вопрос
Следующий вопрос
Похожие вопросы
Предмет: Русский язык, автор: alikulovamarya
Образуй имя прилогательное к слову сосед
1 год назад
Предмет: Английский язык, автор: Ariel2307
Перевод на английский слов : орёл, сокол, ястреб
1 год назад
Предмет: Английский язык, автор: waswere215
срочно! нужны вопросы к каждому предложению на английском !!






Dmitri Hvorostovsky is one of the most famous singers in the world. He often takes part in performances in different countries and always becomes the centre of attraction. Some fans call him the "Elvis of opera". When Hvorostovsky heard about this, he thought it was a huge compliment since to him, Elvis had been a kind of revolutionary.
Hvorostovsky was born in Krasnoyarsk in Siberia — there he studied at school, and for some time had been the singer in a rock band where he had been playing heavy metal. After Hvorostovsky won several professional contests in Russia, Irina Arkhipova encouraged him to take part in the Cardiff Singer of the World competition in 1989. He won it and his world career launched.
His manner of singing is very lyrical and it is sometimes called "old school". He works with theatres and singers all around the world. Some years ago he recorded an album with Olga Borodina. Now Hvorostovsky has a house in London and speaks good English. He works a lot and tries to have a healthy way of life. He confessed that he had given up smoking and had stopped drinking alcohol many years ago. He knew this would help him perform his best in his profession.
1 год назад
Предмет: Математика, автор: 89134398011
Помогите решить задачу
8 лет назад
Предмет: Алгебра, автор: 5Симка5
Помогите!!!
у= -х^2 -1, каково будет наибольшее значение функции, и если можно ход решения
8 лет назад