Предмет: Алгебра, автор: NaimoRHardbro

Як обчислити cos315°

і як обчислити tg225°

ПОМОЖІТЬ ПЖ ДУЖЕ СРОЧНО!!!!

Ответы

Автор ответа: mariostoner06
0

Ответ:

cos315°=√2/2.

tg 225°  = 1

Объяснение:

Для того, чтобы решить эту задачу, нужно вычислить значение котангенса для с угла с градусной мерой 315 °.

1)  представляем cos 315 как cos(360 – 45):

2) cos(360° – 45°) = cos45° = 1/√2 = √2/2.

tg (180°+α) = tgα

tg 45° = 1  

tg 225° = tg (180°+45°) = tg 45° = 1.

Похожие вопросы
Предмет: Английский язык, автор: sassa02
Раскройте скобки и поставьте глагол в Past Simple или в Past Perfect .

1. When I ( to come ) home , mother ( to cook) dinner .
2. When father ( to return ) from work , we already ( to do ) our homework .
3. When the teacher ( to enter ) the classroom the pupils already ( to open ) their books.
4 . Kate ( to give ) me the book , which she ( to day ) before yesterday.
5. Nick ( to show) the teacher the picture wick he ( to draw)
6. The boy ( to give ) his sister the flowers which he ( to bring ) from the field.
7. Mother ( to see) that Nick ( not to wash) his hands. .
8. The teacher ( to understand ) Ann ( not to do ) her homework.
9. I ( to learn ) that my friend ( not to come ) yet .
10. I (to finish) my work at 7 o'clock .
11. I (to finish) my work bay 7 o'clock.
12. He( to think )that he (to lose ) his money .
13. Where the children ( to wake up) yesterday, the father already ( to leave ) for work .
14. Yesterday she ( to write) a letter to a friend , whom she ( to meet) in the summer.
15. He ( to study) French before he ( to enter ) the University.
16. Everybody ( to know) that their teacher ( to get ) an education in Parish .
17. He (want ) to play the main role , because he ( to organize) the theatre .
18. Lanny ( not to know) who ( to attack) him in the darkness .
19. The girl ( to de ) glad that she ( to find ) a windows seat .
20. By the time the trine ( to reach ) the station he ( to make )find with many passengers .
Срочно помогите .
Предмет: Английский язык, автор: vik2304