Предмет: Математика, автор: Dilyya

найти множество  значений функций  y=2cos2x-2
помогите плиииз

Ответы

Автор ответа: Аноним
0
-1≤cos2x≤1
-2≤2cos2x≤2
-2-2≤2cos2x-2≤2-2
-4≤2cos2x-2≤0
E(y)=[-4;0]
Похожие вопросы
Предмет: Английский язык, автор: wwwekaterinka2
1. Mary doesn’t mind _______________ (do) housework, but she hates _________________ (cook).

2. I don’t know how ___________________ (use) my new mobile phone.

3. ______________ (park) here is forbidden. Look at the sign!

4. Dr Lewis advised Peter ______________(reduce) of fatty food.

5. Please, stop _________________ (make) so much noise.

6. Don’t forget _________________ (buy) some bread when _______________ (come) back home.

7. Why don’t we stay at home instead of ______________ (go) out tonight?

8. I do my best, but I find it hard ________________( get) up early.

9. Mary insisted on ___________________ (help) with the housework.

10. Excuse me for __________________ (interrupt) you.

11. It was really nice _________________ (meet) Peter at the restaurant.

12. You’d better __________________ (tidy) your room or mum will get angry.

13. The rain prevented us from _________________ (play) outside.

14. He spent a lot of time _________________ (choose) what ____________ (wear) at the fancy dress party.

15. It’s no good __________________ (waste) your time ______________ (watch) TV.

16. We’re looking forward to ____________________ (travel) to New York next summer.

17. There’s no point in _____________ (take) a taxi, the cinema is just a five-minute-walk from the pub.

18. Definitely the curtains need _________________ (clean).

19. I remember Tom _________________ (walk) to school when he lived next door.

20. Carol offered _______________ (post) the letter for me.

*21. The criminals denied _________________ (rob) the bank.

*22. I’m so thirsty! I need _______________ (drink) something immediately.

*23. Sally asked her brother _______________ (open) the window.

*24. My husband tends _______________ (forget) things these days.

*25. Andy pretended ________________ (be) tired, but we made him __________________ (clear) *the table.