Read the words and plan: breakfast, lunch, dinner, tea and supper.bread, biscuit, soup, meat, fish, sugar, porridge, cabbage,potatoes, pudding, poultry, carrot, cheese, sausage, fruit, salad,cream, ice-cream, jam, cake, tea, coffee, milk, juice, butter.​

She visits musical school every day
look! boys of your form are playing football
i;m happy i will fly home tomorrow
the bus left at 6:30 p.m.
why are you angry? my sister is always taking my clothes
they met at hte station two hours ago
she doesn't like flying by plane
i'm cold. i didn't t put on my jacket
i will be playing the violin when my friend comes in
did you go to the cinema yesterday
i thin tom will be a doctor when he grow up
she hasn't taken her driving test yet
what was you doing at 8 oclock yesterday
she has been typing latters for three hours
my son will be five in august
my brother fixed the washing machine
im sure kelly will let you borrow her cds
he is leaving tokyo next monday
it was sunday yesterday i didn't go to school
john and andy have lived in spain since 1987

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