Доказать тождество:(1-sin^2(-a))(1+(tg^2)a)=1 - №6831966

Доказать тождество:
(1-sin^2(-a))(1+(tg^2)a)=1
- Предмет:
  Алгебра
- Автор:
  troy575
- 6 лет назад

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- Автор:
  dirty harry6a2j
- 6 лет назад
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VARIANT II
I. Complete the sentences with the words in the box.

His their its her your

1. She is a pop star. her name is Ann Williams.
2. Peter has a lot of friends. his friends are students.
3. They want ….. phone number. Pleas tell it to them.
4. Bill and Rose like their house.
5. This city is great …. Name is Paris.

II. Complete the sentences with the forms of BE.

1. My father is from Russia.
2. I … seventeen.
3. Where ... you from?
4. Who … her favourite sports star?
5. How old … your daughter?

III. Make the following sentence plural.

1. That book isn’t interesting.
2. This room is nice.
3. Pass me that box.

IV. Complete the sentence with HAVE/HAS GOT. Translate.

1. … you … a pet?
2. My room is great! It …. … blue walls and a red carpet.
3. He’s got a brother but he … … a sister.
4. … your sister … a garden?
5. I …. …… ……. a car. I go by bus.

V. Translate from Russian into English with can, can’t.
1. Он умеет нырять.
2. Катя умеет быстро бегать?
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VI. Make the sentences negative.
1. Open the window.
2. Be late.
3. Write on the board.
VII. Make the sentences with there is, there are. Translate into Russian

1. football classes (+)
2. a gym (?)
3. swimming pool (-)
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родственные слова к слову укоротить
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THE INTERNET: HERE TO STAY
Most people today cannot imagine their life wit hout the Internet. I believe it is one of the most important innovations. Thanks to the worldwide web, our lives have become easier and more exciting.First of all, the Internet helps us find information easily. For example, we can read the news and find answers to the questions 24 hours a day.In addition, we can use the Internet for entertainment. We can send e-mails to friends and shop online. We can even listen to the latest music and watch live sporting events from other parts of the world.However, some people argue that the Internet has a negative effect on society. Internet users become less sociable. They stay at home most of the day instead of going out to shop, work and meet friends.In my opinion, the Internet has more advantages than disadvantages. Our lives are better with it and 1 hope it is here to stay.

1. Most people nowadays____
A) cannot live without the Internet
B) imagine their life without the Internet
C) live without the Internet

2. Thanks to the worldwide web, our lives have become __
A) difficult and more stressful
B) simpler and more interesting
C) easier and more stressful

3. The Internet is important mostly because ______
A) it allows us to find information easily
B) it provides cheap shopping online
C) it plays the latest music hits

4. We can use the Internet for fun, as we can _____
A) work on assignments
B) send e-mails to friends
C) read the news

5. The biggest disadvantage of the Internet is ______
A) that you have to go somewhere to work out
B) that you can't live a normal life
C) that it can change our daily routines

6. The Internet has ______
A) more disadvantages than advantages
B) more advantages than disadvantages
C) as many advantages as disadvantages
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- Автор:
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1 hour 1 day 100 years