Если я не сделаю мне в школе жо

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

1 answer the questions.

1. pinky has them.

2. its black

3. its red

4. she isnt.

5. shes with her sister.

6. mrs paw helps them

7. they are in the garden

8. hes swimming

9. hes reading

10. hes watching birds.

2. match

1. pinky has got a pink nose

2. blackie has got a black tal

3. reddy has got red ears

true or false

1. false

2. true

3. true

4. false

4 what is it

1. radio

2. book

3. chair

4. song

5. ladder

ii. a nice day

1 answer the question.

1. they are in the house

2. hes sleeping

3. hes sitting

4. hes playing

2. match

pinky is in the cupboard

blackie in on the sofa

reddy is under the chair

3 fill in: am, is, are.

1. are

2. is

3. am

4. are

5. are

4 what is it

1. cupboard

2. chair

3. bed

4. tall

iii. an apple ball

1 answer the questions.

1. its autumn

2. its pnkys

3. a ball and a box of chocolates

4. she has a baby son

5. tea is what they drink

6. there is

2 what is it

1. ball

2. apple

3. tea

3 true or false

1. false

2. true

3. true

4. false

5. false

4 fill in: have got, has got, is, are, am.

1. is

2. has got

3. are

4. have got

5. are

6. am

7. have got

iv. snow

1. match

make a snowman

play a snowballs

throw a snowball

put on clothes

look through a window

2 fill in: they, i, me, them, us, we.

1. i

2. me

3. them

4. they, we

5. us

3. match

i my

he his

we our

she her

they their

it its

you your

4. anwer the questions

1. its cold

2. in the living room

3. warm clothes

4. she runs

5 put the sentences in the correct order.

1. they are in the living room.

2. pinky runs in the snow.

3.blackie goes out.

4. reddy puts on his warm clothes.

5. they play together.