Предмет: Математика, автор: valya999999

Решите пожалуйста 2cos^3x-cosx-1=0

Ответы

Автор ответа: SixATNine

0

2cos^3x - cosx = 1.
пусть cosx = t
2t^3 - t =1
t(2t^2-1) = 1
t = 1
вернёмся к замене:
cosx = 1
x = 0 + 2(ПИ)k, k принадлежит z.

Предыдущий вопрос

Следующий вопрос

Интересные вопросы

Предмет: Математика, автор: nani1124

помогите пожалуйста разобраться

6 лет назад

Предмет: Английский язык, автор: botagozukuseva664

ТЕКСТ ЗАДАНИЯ
Healthy Food
1. Read the following texts.
Kate, 20, Missouri
I'm a model, so I have to eat healthy foodl I eat vegetables,
soup, fruit and a lot of water. I like junk food like burgers or
hot dogs, but I can't eat them. Sometimes I eat chocolate,
sweets or bread and jam of the weekends, but only when I feel
really downl I eat much fruit, milk and cereal for breakfast,
and I always have soup for dinner. If you eat healthy food, you
will be healthy...and thin!
Mike, 17, London
des
I have a very busy life at school so I eat a lot of junk
food. I never eat breakfast, because I don't have
time. Then, in the school canteen, I eat a chocolate
Heithy Food worksheet
bar, crisps or a cake. I love cola, so I drink in me
time! For lunch I usually eat chicken or pizza, or a
burger, and I always have dinner at home, so I have to
eat soup and fruit. But I always have sweets and
biscuits in my room to eat before going to bed!
Read the text and write True or False
1. Kate only eats healthy food
2. Kate always eat soup for dinner
3. Mike eats healthy food for breakfast
at the school canteen
4. Mike never eats fruits

6 лет назад

Предмет: Қазақ тiлi, автор: nastyakodddd

УЧЕНЫЕ, ОТЛИЧНИКИ✓ ПОМОГИТЕ

срочно.!!!!!

6 лет назад

Предмет: Алгебра, автор: taya13

Помогите даю много баллов!!!
16*(2 в минус 3 степени) все в скобках и в квадрате !!

9 лет назад

Предмет: Биология, автор: 9829

5 примеров ,о пелезных и вредных, 5 растений ,5 животных

9 лет назад