Question

2) cos 150 - cos 30вычислить ​

Answer 1

Ответ:

Объяснение:

120cos

Answer 2

To calculate cos 150 - cos 30, we can use the trigonometric identity:

cos(A - B) = cos A cos B + sin A sin B

Applying this identity, we have:

cos 150 - cos 30 = cos (150 - 30) = cos 120

Now, let's find the value of cos 120.

cos 120 = cos (180 - 60) = -cos 60

Since cos 60 = 1/2, we have:

cos 120 = -1/2

Therefore, cos 150 - cos 30 = -1/2.