варенье может фотосинтезировать

область вызначения функцыи. помогите кто а?* прогулял урок ничиво незнаю)

1)у=3 sin(-х) построить график

2)у=3 sin х/2 построить график

7. Open the brackets to make the sentences complete.  A. Past indefinite or present perfect?  1. Nancy (travel} a lot in her life. She (be) to many countries. Last year she (visit}  Greece. 2. Hello, Pat! I'm glad to see you in Oxford again. How long you {be) here? When  (arrive)9 3. When you first (meet) your teacher? How old you {be) then? How many  years you (know) him already? 4. You ever (taste) any tropical fruit? Where you {eat) it? You '(like) it? 5. — Helen (write) the letter yet? — No, she ... . She', (begin} doing it only ten minutes ago. 6. She says she always (want) to come to Australia. Now she is happy, she (be}  here sinceThursday. 7. Kate (not, type) all the letters. She (type) three of them yesterday. But she (not. do) anything today. 8. Uncle Tom never (fly) in his life. But the other day he {make up) his mind to take a flight to America.