Исправить неверные утверждения нужно сдать работу до 00:00 (4ч) ​

1.+I do morning exercises

-I don't do morning exercises

?Do I do morning exercises

2.+He works at a factory

-He doesn't work at a factory

?Does he work at a factory?

3.+She sleeps after dinner

-She doesn't sleep after dinner

?Does she sleep after dinner?

4.+We work part-time

-We don't work part time

? Do we work part-time

5.+They drink tea every day

-They don't drink tea every day

? Do they drink tea every day?

6.+Mike is a student

-Mike isn't a student

?Is Mike a student?

7.+Helen has a car

-Helen doesn't have a car

? Does Helen have a car?

8.+You are a good friend

-You aren't a good friend

?Are you good friend?

9.+You are good friends

-You aren't good friends

? Are you good friends?

10.+It is difficult to remember everything

-It isn't difficult to remember everything

? Is it difficult to remember everything?

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