Решить уравнения (cos5x+cos7x)^2=(sin5x+sin7x)^2 - №30451020

Решить уравнения (cos5x+cos7x)^2=(sin5x+sin7x)^2
- Предмет:
  Математика
- Автор:
  mauriciobecker
- 5 лет назад

Ответы 1

(2cos6x*cosx)²=(2sin6x*cosx) :4 (cosx)² cosx не равно 0
cos²6x-sin²6x = 0
cos12x=0
12х = π/2 + πn
x= π/24 + πn/12
- Автор:
  helenatrevino
- 5 лет назад
- 0
Добавить свой ответ

Еще вопросы

Найти производную. Тело движется по закону x(t)= -2t^2+5t+4. Найти U(t)
- Предмет:
  Математика
- Автор:
  dozerbarker
- 5 лет назад
- Ответов:
  
  1
- Смотреть
Traditional American Food Americans eat a lot. They have three meals a day: breakfast, lunch and dinner. Most of Americans don't eat home but prefer to go to restaurants. They can choose from many kind of restaurants. There is a great number of ethnic restaurants in the United States. Italian, Chinese and Mexican food is very popular. An American institution is the fast food restaurant, which is very convenient but not very healthy. However there are some principles of American cuisine (if we may call it so). Americans drink a lot of juices and soda, eat a lot of meat, fruits and vegetables, not much bread. In the morning Americans have cereal or scrambled eggs, milk or orange juice. Chicken or fish, fried potatoes, vegetable salads, and desert: this is the most common menu for lunch. Dinner is probably the most important meal of the day, some people have family dinner, when all members of family have to be there. For dinner Americans usually have meat, fried or baked potatoes with ketchup or sour cream, corn, peas, sometimes macaroni and cheese or spaghetti; ice-cream, fruit or cake may be for dessert. Turkey, ham and apple pie are traditional for Christmas and Thanksgiving Day dinners. Questions: 1. How many times a day do Americans eat? 2. Do Americans like to eat at home? 3. What kind of restaurants is popular in the US? 4. What do Americans eat for breakfast? 5. What is the most important meal of the day? 6. What is a family dinner? 7. What dishes are traditional for Christmas and Thanksgiving Day dinners?
- Предмет:
  Английский язык
- Автор:
  velvet
- 5 лет назад
- Ответов:
  
  1
- Смотреть
Какие страны и Императоры т.д участвовали в 1ом ,2ом ,3ем ,4ом крестовом походе и какие страны были захвачены ?
- Предмет:
  История
- Автор:
  emmyaic5
- 5 лет назад
- Ответов:
  
  1
- Смотреть
Соченения дубровский и троекуров 6 класса 150-200 слов
- Предмет:
  Литература
- Автор:
  amosharris
- 5 лет назад
- Ответов:
  
  1
- Смотреть

How much to ban the user?

1 hour 1 day 100 years