Предмет: Математика, автор: vasily001

Тригонометрические уравнения

1) cos x+2 = 0

2)sin 3x = -1/2

3)*корень 3* the 2x + 1 = 0

Ответы

Автор ответа: olya115153
3
1) cosx+2=0
cosx=-2
x-не имеет корней
ответ: нет корней
2) sin3x=-1/2
3x=(-1)^(k+1) pi/6+pik, где k-любое число
x=(-1)^(k+1) pi/18+pik/3, где k-любое число
ответ: (-1)^(k+1) pi/18+pik/3, где k-любое
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It's the 21 st of October, 10 o'clock in the morning. Mr. Blake has come to the Russian Trade Delegation.

Blake: Good morning! My name's Blake. I'm from Blake and Co. I've got an appointment with Mr. Voronin at 10.15.

Receptionist: Good morning, Mr. Blake. Mr. Voronin is expecting you. Will you take a seat, please? Blake: Thank you. I'm a bit early, actually. Receptionist: That's all right, Mr. Blake.

(In a few minutes Voronin comes downstairs to meet ' him).

Voronin: Oh, Mr. Blake, it's nice to see you here. How are you? Blake: Fine, thanks! And you? Voronin: Pretty well too, thank you. This way, please.

(They come into the conference room and take their seats at the table.)

Voronin: Would you like a cup of coffee? Blake: Yes, please. It's very cold and wet outside today. Voronin: Yes, the weather hasn't been very good lately. Blake: That's right, but it's usually warm here in October. Now,

Mr. Voronin, how about our quotation and catalogues? Have you looked through them?

Voronin: Sure! We've studied them closely. The new model is certainly good. Blake: Yes, it's of high quality. We've just starting producing the model and we've already received a lot of orders.

Voronin: Your machines meet our requirements and we are interested in buying them. Mr. Blake, have you seen our contract form? Blake: Not yet.

Voronin: Would you like to look through it?

Blake: I certainly would.

Voronin: Here you are Mr. Blake. Please study our terms and let's meet again next on Tuesday. Blake: All right, Mr. Voronin. Good-bye for now.
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