Предмет: Алгебра, автор: 195862

докажите тождество 2cos2a*tga/sin2a-cos2a=-tg2a

Ответы

Автор ответа: ХорошийМатематик

Это совсем не тождество.

Графики на присоединённом рисунке.

Приложения:

Предыдущий вопрос

Следующий вопрос

Похожие вопросы

Предмет: МХК, автор: braunksenia16

Установи соответствие между изображением и видом выставки.

6 лет назад

Предмет: Английский язык, автор: Аноним

1. Make questions in the Present Simple Tense. How much______ (the tickets/cost)?

A. How much are the tickets cost?

B. How much does the tickets cost?

C. How much do the tickets cost?

D. How much is the tickets cost?

E. How many money do the tickets cost?

2. Make negative sentence in the Present Simple Tense. They_________ (not/watch) sports on TV.

A. They don't watch sports on TV.

B. They isn't watch sports on TV.

C. They aren't watch sports on TV.

D. They doesn't watch sports on TV.

E. They aren’t watch sports on TV.

3. Make questions in the Present Simple Tense.

What_______ (Dana/wear) when she plays rugby?

A. What are Dana wear when she plays rugby?

B. What do Dana wear when she plays rugby?

C. What does Dana wear when she plays rugby?

D. What is Dana wear when she plays rugby?

E. What has Dana wear when she plays rugby?

5. Put the words in the correct order.

figure skating / on TV / watch / I / sometimes / watch /.

A. I watch sometimes figure skating on TV.

B. I sometimes watch figure skating on TV.

C. Sometimes watch I on TV figure skating.

D. Figure skating I watch on TV sometimes.

8 Read the description and find the word. It can sing. What is it? Don’t choose bird.

A. a dombra

B. Lake Kaindy

C. Singing Sand

D. an eagle

E. a bird

10. Choose the correct preposition. It’s great to listen __ his story.

A. to

B. -

C. of

D. at

E. for

11. What fruit comes from Kazakhstan?

A. banana

B. apple

C. watermelon

D. grapes

E. peach

14. Make a noun from collect

A. collectin

B. collecsion

C. collection

D. collective

E. collectness

15. Solve the puzzle

A. boy

B. break

C. brick

D. book

E. brook

17. Change the word into “it”:

A. Dogs

B. Car

C. Children

D. Mary

E. Apples

19. Compare “The country is … than the city”:

A. Healthier

B. More healthy

C. Much healthy

D. Health

E. Healthyer

20. Write the date “15 July”:

A. Fifteen in July

B. Fifteen of July

C. The fifteenth of July

D. July, fifteenth

E. The fifteen of July

21. Put the question to the sentence: I (go) to school?

A. Is I go to school?

B. Do I go to school?

C. I go to school?

D. Go I to school?

E. Goes I to school?

22. Odd-one-out.

A. Wonderful

B. Happy

C. Important

D. Favourite

E. Hobby

24. Odd-one-out.

A. Riding a bike

B. Stamp collecting

C. Painting

D. Computer studies

E. Photography

ПОМОГИТЕ!!!!!!!!!!!!!!

6 лет назад

Предмет: Литература, автор: dmrngkf

Синквейн по повести "Олеся" Иван.

6 лет назад

Предмет: Биология, автор: leeek

значение грибов в природе и жизни человека. ПЛИЗЗЗЗ!СРОЧНО!

9 лет назад

Предмет: Химия, автор: Tonic

Какие естественные науки изучают следующие процессы:горения угля,искривление гвоздя,плавление серы,похолодание,дождь,ржавление железа?

9 лет назад