Предмет: Математика, автор: demon85

sinx=sin3x помогите пожалуйста, не знаю как решить это уравнение

Ответы

Автор ответа: aisulukairakpa

sin(3x)-sin(x)=0

2*sin((3x-x)/2)*cos((3x+x)/2)=0

2sin(x)*cos(2x)=0

1) sin(x)=0

x=pi*n

2) cos(2x)=0

2x=(pi/2)+pi*n

x=(pi/4)+pi*n/2

Предыдущий вопрос

Следующий вопрос

Похожие вопросы

Предмет: Английский язык, автор: israil82

Formative work
Choose the correct option in each sentence.
1. He is so ; he loves buying everyone expensive presents.
B optimistic
C warm
A generous
D considerate
2. That's the most amazing plan! I don't know how you always up such good ideas
A brin
B come
C turn
D think
3. I don't have any brothers or sisters, so I am a (an) child.
A free
B only
Calone
D single
4. Peter is very unkind to his half sister. I think he's a really person
A dishonest
B hot-tempered
C cold-hearted
D unfair
5. I don't know who my real parents are because I was when I was a very small baby.
A divorced
B looked after
C brought up
D adopted
Complete the sentences with the correct form of the word in bold. You should use negative prefixes.
6. She's so clever; she's of failing an exam. CAPABLE
7. Don't you know that it's to travel without a ticket? LEGAL
8. He was quite as a baby, but now he is very good looking. ATTRACTIVE
9. My stepbrother is really because he cheats in tests and tells lies. HONEST
10. That's a really rude thing to say! I didn't expect you to be so POLITE
Complete the sentence with correct preposition.
11. I keep touch with my friends by email.
12. I get well with my younger sister
13. My brother blamed me losing his book.
14. When my mother is at work, our neighbour looks us
15. I am going to complain
your behaviour
16. My father deals a lot of different people at work.
Choose the correct answer.
17. My brother and I speak/are speaking Spanish because our stepfather is from Cuba.
18. My sister is very ambitious and always studies / is studying very hard.
19. Until we move to our new house next month, I share / am sharing a room with my stepsister.
20. You look/ are looking as if you have seen a ghost. Are you okay?
21. The flowers Mum received for her birthday smell / are smelling, wonderful.
22. You can't speak to Paul now because he is taking/takes a bath.
23. My new job is great now! I love / am loving it!
24. Sandra tastes/ is tasting the food to see if it needs more salt.

5 лет назад

Предмет: Математика, автор: annanimo4ka92

Автобус скорость которого 60 км/ч проехал некоторое расстояние за 3,5. За сколько часов автобус проедет такое же расстояние, если скорость увеличить на 10км/ч?
A.2,8ч; B.3ч; C.2,5ч; D.3,2ч.
(на фото это пример)вот так как на фото примерно сделать срочноооооо

5 лет назад

Предмет: Русский язык, автор: Аноним

ПОМОГИТЕ РУССКИЙ ЯЗЫК

5 лет назад

Предмет: Алгебра, автор: Molderjkee

Что такое сомнительные и верные числа?
Вообще не понимаю, покажите на примерах, спасибо!

9 лет назад

Предмет: Математика, автор: akmyratastana

запишите уравнения окружности с центром в c(1,-2) которая касается оси 0y

9 лет назад