2cos^2a*tga/cos^2a-sin^2a спросите пример - №22130645

2cos^2a*tga/cos^2a-sin^2a спросите пример
- Предмет:
  Математика
- Автор:
  blanco
- 6 лет назад

Ответы 1

$\frac{2cos^2atga}{cos^2a-sin^2a} = \frac{2cosasina}{cos2a} = \frac{sin2a}{cos2a} = tg2a$
- Автор:
  lila
- 6 лет назад
- 0
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Exercise 1 Questions and answers
Complete the questions and answers with the correct auxiliary verb.
Example Where do you work? In a design studio in the city centre.
1 _____ you have a nice birthday?
Yes, I _____ , thanks. We went out for dinner.
2 What ______ Alan look like?
He’s tall and slim.
3 What ______ you doing when we had the power cut?
I ______ writing an email.
4 _______ Tim working abroad at the moment?
No, he _______ . He’s on holiday.
5 What colour eyes _____ the baby got?
Blue, just like her dad.
6 What_____ your new boss like?
She’s nice. Very friendly and easy-going.
7 ____ you ever been to Cuba?
Yes, we ______ . We went there last year.
8 What ______ Annie like doing?
She enjoys reading and painting.
9 Why _____ you answer the phone when I called you?
Sorry, I _____ listening to music so I didn’t hear it.
10 ______ Fiona been working here long?
No, she ______ . She started about a month ago.
16
Exercise 2 Present tenses and future forms
Complete the blog with the correct form of the verbs in brackets. Sometimes more than one answer is possible.
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