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0513072813
0513072813
08.05.2020 16:40 •  Английский язык

Insert prepositions of time. Write down six answers with a comma (,).

Примечание: Запишите шесть слов (без цифр) через запятую. Все слова должны начинаться с маленькой буквы. Точку в конце ставить не нужно.

Example answer: in, at, at, on, on, in

1) Was Easter May last year?

2) Is your birthday summer?

3) I'm going to have a party the end of the week.

4) I usually come home ___ three o’clock.

5) I always take a shower the evening.

6) I tidy my room ___ Sunday.

👇
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Ответ:
Yarmoshenkobchmd
Yarmoshenkobchmd
08.05.2020
Сначала формулы . затем формулы двойного угла sin2α=2sinαcosα cos2α=cos²α-sin²α=cos²α-(1-cos²α)=2cos²α-1⇒  2cos²α=1+cos2α cos2α=cos²α-sin²α=1-sin²α-sin²α=1-2sin²α⇒  2sin²α=1-cos2α а) сos75°cos105°=cos(90°-15°)·cos(90°+15°)== sin15°(-sin15°)=-sin²15°=-(1-cos30°)/2=(cos30°-1)/2= ((√3/2)-1)/2=0,25√3-0,5б) sin75°sin15°=°sin(90°-15°)sin15°=cos15° sin15°=sin30°/2=1/4=0,25в) sin105°cos15°=sin(180°-75°)cos15°=sin75°cos15°=sin(90°-15°)cos15°=cos15°cos15°=(1+cos30°)/2=(1+(√3/2))/2=0,5 +0,25√3 2 способ формулы cosα·cosβ=0,5cos(α-β)+0,5cos(α+β) sinα·sinβ=0,5cos(α-β)-0,5cos(α+β) sinα·cosβ=0,5sin(α+β)+0,5sin(α-β) а) сos75°cos105°=0,5cos(75°-105°)+0,5cos(75°+105°)=0,5cos(-30°)+0,5 cos180°==0,5· √3/2+0,5·(-1)=0,25√3-0,5б) sin75°sin15°=0,5cos(75°-15°)-0,5cos(75°+15° )=0,5cos60°-0,5 cos90°=0,5·0,5=0,25в) sin105°cos15°=0,5sin(105°+15°)+0,5sin(105°-15°)= =0,5sin120°+0,5sin90°==0,5 sin(180°-60°)+0,5·1=0,5 sin 60°+0,5=0,25√3+0,5
4,7(7 оценок)
Ответ:
маьтвор
маьтвор
08.05.2020
1. The day was cold and it was raining. When I reached home, my raincoat was all wet. I took it off, shook the water off it, hanged it up and went into the living-room. My children were playing on the carpet. When they saw me, they jumped up and ran up to me. 2. I have heard this song several times already, but I cannot remember the words. I wrote them down as soon as I had heard this song again. 3. Hardly he had opened the suit-case, when he found the tie which he thought he had lost long before. 4. Shut the door! The room is full of smells which are coming from the kitchen. Mother doesn't like kitch­en smells in the room. 5. Last night he finished the book which he had begun (began) writing a year ago. 6. He said he had been listening to the same stories for a long time. 7. By the evening he had translated ten pages. 8. Have you ever been to the new stadium? — Yes, I was there last Saturday. 9. The old lady was happy: she hadn't seen her son for three years. 10. What did you do yesterday? 11. How many pages have you translated for today?
4,6(48 оценок)
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