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Stikki
Stikki
08.04.2020 08:26 •  Английский язык

13. Choose the correct item. How old are the girls?
12 and 14.
A) Their
6) There
B) They're
r) She's

👇
Ответ:
543421
543421
08.04.2020

They're 12 and 14

B) They're

4,8(13 оценок)
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Ответ:
Yarmoshenkobchmd
Yarmoshenkobchmd
08.04.2020
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:
hedgehogGreen
hedgehogGreen
08.04.2020
Of all the holidays of the year I like best two — birthday and New year, but New year, probably more because celebrating its not only you, but all your friends, acquaintances, and not friends to you. From this the soul becomes more joyful and solemn, and the closer to the end of December, the more heart-stopping in anticipation of miracles and gifts. I no longer believe in Santa Claus and the snow maiden, but without them what kind of New year? ! So happy, like old friends, their appearance on TV screens, on the shelves with toys, postcards, and billboards.New year. 
At the end of December the streets, parks and squares dress up in festive attire. Through the squares and streets stretched garlands of coloured lamps. All ready for the New year! It's my favorite holiday. 
But most of all I like to meet New year at home. I decorate the Christmas tree, hang on her toys, garlands. We have lots of toys new and old. And each has a story behind it. This curly horse my mother gave when she first learned to skate. Skater she did not, but the beautiful Christmas toy store. But this nondescript ball - the first Christmas gift from my grandmother. If you look closely, you can see how inside twinkling fairy lights. 
The whole tree shines with colored lights. Us attracts visitors. Mom lays a holiday table. And so the clock strikes 12 times - the New year starts. Then we go out into the street filled with people. Congratulations to all
4,8(94 оценок)
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