Question

A) cos 210°= Помогите пожалуйста очень срочно нужно сделать чтобы получить доступ к мэрии города и области применения в качестве примера я не могу зайти в личный кабинет на сайте и в каком виде вам задали вопрос по поводу бизнеса в интернете и не только​

Answer 1

cos210=cos(180+30)=-cos30=-√3/2

Answer 2

A) To find the value of cos 210°, we can use the unit circle or trigonometric identities.

Using the unit circle, we can see that 210° is in the third quadrant, where the cosine function is negative. The reference angle, which is the angle formed between the terminal side of the angle and the x-axis, is 30°. Since cosine is positive in the first quadrant, we can find the cosine of the reference angle, which is cos 30°.

cos 30° = √3/2

However, since 210° is in the third quadrant where cosine is negative, the value of cos 210° is -√3/2.

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