The tree 1 The parrot is
A on
B under
the tree.
2 Liam is climbing
A up
B down
the tree.
3 The sun is
A above
B under
the big tree
4 Lilly is
and the dog.
A between
illy
B in front of
is Jake.
5 The boy
A on the left
B on the right​

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

do - did - done
think - thought - thought
make - made - made
live - lived - lived
do - did- done
eat - ate - eaten
dance - danced - danced
hit - hit - hit
take - took - taken

 

Task 2.
Past Simple: He asked a question. She spoke in Germany. They were in their room. They didn't drive the car. Alex didn't forget his homework.
Present Perfect: He has asked a question. She has spoken in Germany. They have been in their room. They haven't driven the car. Alex hasn't forgotten his homework.

Task 3.
Past Simple: Did you finish homework? Did Kate kiss Mark? Did waiter bring the juice? Did he pay the bill? Did you write a song?
Present Perfect: Have you finished homework? Has Kate kissed Mark? Has waiter brought the juice? Has he payed the bill? Have you ever write a song?