1)tg x =1; 2)tg x =[tex]-\sqrt{3}[/tex]; 3) ctg x =1; 4) ctg x =[tex]\frac{\sqrt{3}}{3}[/tex]

графическое решение примеров

P.S. Скажите хотябы точки =)))

Зарание большое спасибо :)

Правильный треугольник ABC проектируется в прямоугольный треугольник ABC1.
Найдите угол между плоскостями этих треугольников.

Помогите, пожалуйста. Задание в прикрепленном файле. C1

Упр. 200. Раскройте скобки, употребляяглаголыводномизследующихвремен: Present Simple, Past Simple, Present Continuous, Past Continuous. 1. Nina (to celebrate) her birthday yesterday. Her room looked beautiful, there (to be) many flowers in it. When I (to come) in, somebody (to play) the piano, two or three pairs (to dance). 2. Listen! Somebody (to play) the piano. 3. I (to like) music very much. 4. When I (to look) out of the window, it (to rain) heavily and people (to hurry) along the streets. 5. What you (to do) at seven o'clock yesterday? — I (to have) supper. 6. When I (to come) home yesterday, I (to see) that all my family (to sit) round the table. Father (to read) a letter from my uncle who (to live) in Kiev. 7. Where you (tobe) yesterday? — I (to be) at home the whole day. — How strange. I (to ring) you up at two o'clock, but nobody (to answer). — Oh, I (to be) in the garden. I (to read) your book and (not to hear) the telephone. 8. What you (to do) at five o'clock yesterday? — I (to work) in the library. — I (to be) there, too, but I (not to see) you. 9. Yesterday I (to work) at my English from five till seven. 10. It (to rain) the whole day yesterday. 11. Where your sister (to be) now? — She (to be) in her room. She (to do) her homework.

Упр. 201. Раскройте скобки, употребляяглаголыводномизследующихвремен: Present, Past, Future Simple; Present, Past Continuous. 1. Look at these children: they (to skate) very well. 2. You (to skate) last Sunday? — Yes, we (to skate) the whole day last Sunday. We (to skate) again next Sunday. 3. My brother can skate very well. He (to skate) every Sunday. 4. What you (to do) now? — I (to wash) the dishes. 5. What you (to do) at three o'clock yesterday? — I (to have) dinner. 6. You (to have) dinner now? 7. Where your brother (to work)? — He (to work) at an institute. 8. Your grandmother (to sleep) when you (to come) home yesterday? 9. What your brother (to do) tomorrow? 10. I (not to go) to the shop yesterday. I (to go) to the shop tomorrow. 11. Where Kate (to go) when you (to meet) her yesterday? 12. Every day the boss (to enter) the office at nine o'clock. 13. Yesterday the boss (to enter) the office at half past nine. 14. When the secretary (to come) tomorrow? 15. At six o'clock yesterday we (to listen) to a very interesting lecture. 16. When I (to enter) the office, the secretary (to type) some letters. 17. My friend (to ring) me up at eight o'clock yesterday.