Предмет: Алгебра, автор: sterva9519

найти 8cos2a , если sina=0,25

Ответы

Автор ответа: physics01

0

8*cos2a =8 (1-2sin^2a)
8*cos2a=8*(1-2*1/16) =7

Предыдущий вопрос

Следующий вопрос

Похожие вопросы

Предмет: Английский язык, автор: ivanka613

Срочно!!!!
1)Would you like tea or coffee? – I ______ have some coffee, please.

2)What are your plans for next week? – I______ fly to New York on business.

3)Did you phone Michael? – Oh! I completely forgot. I ______________do it now.

4)Have you decided what to buy Alex for his birthday? – Yes, I ____________( buy) him a computer game.

5)Did you book a table at the restaurant? – Yes, but I don't expect it__________( be) busy.

6)We have saved enough money so we ___________buy a new fridge.

will
are going to
won’t
is going to

7)One day people ____________live on other planets.

are going to
won’t
will
is going to

8)I don't know how to use this camera.- It's not difficult. _________you. (I / show)

9)We _______(not / spend) my holiday abroad this year.

won’t spend
aren’t going to spend
are going to spend
will spend

10)Make the negative sentence

They will sail this yacht next summer.They ___________sail this yacht.

11)Make the sentence interrogative.

Monica and Sam will clean the flat tomorrow._____Monica and Sam clean the flat?

12)The sky is absolutely dark and cloudy. – It ________ (rain).

7 лет назад

Предмет: Қазақ тiлi, автор: altynaiarystanova12

1.Балаларға және Аянға әріптерді үйретіп, хат танытқан кім?
2.Аянның ертегілері не себепті жетім туралы болды?
3.Әжесі қайтқаннан киін Аян кімнің үйіне көшіпті?

7 лет назад

Предмет: Математика, автор: jfjfjdke9068

Помогите решить 250 и 251 срочно

7 лет назад

Предмет: Математика, автор: dachagracheva22

Помогите пожалуйста решить уравнение 17•(c-2)-36=19+(c-2)•12

10 лет назад

Предмет: Физика, автор: Gifangi

НОМЕР: 36.4 найдите давление спичечного коробка заполненного солью,на кухонный стол в трёх положениях, показанных на рисунке. Масса коробка с солью m = 16 г, размеры h = 5 см, j = 1 см.

10 лет назад