Корнеплодович1930
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Reading Task 2. Read the text. Match the sentences to the pictures. Belling The CatThere lived many mice in a grocer's shop, which are plenty of food, an the grocer suffered very much. So, he brought u fat cat to catch the mice. The mice were worried. They held a meeting to send away the cat.One house said to tie a bell around the cat's neck because the cat moved softly and swifily. So that when the cat moves, the mice would become aware of the cat. All the mice agreed to this decision.The old mouse asked, "Can you tell me who is to bell the cat?" There was no reply.1. There lived many mice in a grocer's A)shop, which are plenty of food, and the grocer suffered very much.2. The grocer brought a fat cat to catch the B)mice.3. The mice held a meeting to send away C)the cat4. One mouse said to tieu bell around the D)cat's neck because the cat moved softly and swiftly, 5. The old mouse asked, "Can you tell me E)who is to bell the cat? поставлю ​

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Olga-Lev1160
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
vfif-804828
Hello - hello  -what are you doing this weekend?   - nothing  - come with me to the computer club  - what is a "computer club"?   - if you love to play computer games, but you do not have a computer, you can play in a computer club.  - wow, this charge? - yes, but it does not require a lot of money  - good. what do i need to bring?   - if you learn well, then you can take the diary. for good learning are free to play   - can i call someone else?   - yes, of course   - i'll see you on saturday?   - well, goodbye  - goodbye

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Reading Task 2. Read the text. Match the sentences to the pictures. Belling The CatThere lived many mice in a grocer's shop, which are plenty of food, an the grocer suffered very much. So, he brought u fat cat to catch the mice. The mice were worried. They held a meeting to send away the cat.One house said to tie a bell around the cat's neck because the cat moved softly and swifily. So that when the cat moves, the mice would become aware of the cat. All the mice agreed to this decision.The old mouse asked, "Can you tell me who is to bell the cat?" There was no reply.1. There lived many mice in a grocer's A)shop, which are plenty of food, and the grocer suffered very much.2. The grocer brought a fat cat to catch the B)mice.3. The mice held a meeting to send away C)the cat4. One mouse said to tieu bell around the D)cat's neck because the cat moved softly and swiftly, 5. The old mouse asked, "Can you tell me E)who is to bell the cat? поставлю ​
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