Sin 2x +4sin^2x=2cos^2x - №16884555

Sin 2x +4sin^2x=2cos^2x
- Предмет:
  Алгебра
- Автор:
  lyric6kqp
- 5 лет назад

Ответы 1

4sin²x+2sinxcosx-2cos²x=0/2cos²x
2tg²x+tgx-1=0
tgx=a
2a²+a-1=0
D=1+8=9
a1=(-1-3)/4=-1⇒tgx=-1⇒x=-π/4+πn,n∈z
a2=(-1+3)/4=1/2⇒tgx=1/2⇒x=arctg0,5+πk,k∈z
- Автор:
  larissa
- 5 лет назад
- 0
Добавить свой ответ

Еще вопросы

Помогите решить домашнее задание.(

1.В 2-х кусках 58 м ткани, причем в первом на 28 м ткани больше, чем во втором. Сколько метров ткани в каждом куске?
- Предмет:
  Математика
- Автор:
  mia6
- 5 лет назад
- Ответов:
  
  4
- Смотреть
как звали капитана школьного клуба по волшебной игре в камни, выпускающие жидкостьв книге "Гарри Поттер"
- Предмет:
  Литература
- Автор:
  coachpasv
- 5 лет назад
- Ответов:
  
  1
- Смотреть
Делимое икс
делитель78
неполное частное96 17остаток
- Предмет:
  Математика
- Автор:
  harleyatkinson
- 5 лет назад
- Ответов:
  
  1
- Смотреть
1. Where _____________(you / go) on holiday last year?
2. Are you hungry? _____________(I/make) some sandwiches for you.
3. I _____________ (know) the family for a very long time.
4. If she comes , he _____________ (get) a surprise.
5. What a lovely day! The sun_____________ (shine) and the sky _____________ (be) blue.
6. Let´s go! We _____________(be) here for more than half an hour
7. She _____________ (go) to the office every day.
8. He _____________(swim) three miles every day.
9. We _____________(go) to the cinema last night.
10. By the end of next year, they _____________ (finish) their homework on the new stadium.
11. Mr. Smith _____________ (sell) his house because it is very old.
12. She is very tired because she _____________(not/ sleep) for two days…
13. We arrived late so the bus _____________ (already/leave).
14. _____________ (you/meet) him last Sunday?
15. By the time he was twenty, he _____________(already/ buy) his own house.
16. She said that she _____________ (come)t o England the following week.
17. I _____________(not/ leave) the station until the train had gone.
18. If you could help me, I _____________ (be) grateful.
19. _____________ (you/let) me use your phone, please?
20. The concert _____________(begin) any moment now.
21. Your letter came while I _____________ (have) lunch.
22. If he doesn´t come, I _____________(never /speak) to him again.
23. We _____________ (not/ live) in England for the last two years.
24. I will never forget what you _____________(tell) me.
- Предмет:
  Английский язык
- Автор:
  snowy
- 5 лет назад
- Ответов:
  
  1
- Смотреть

How much to ban the user?

1 hour 1 day 100 years