Question

Cos123=cos(90+33)=-sin33

Answer 1

Ответ:

Cos 123=cos(90+33)=sin33

Soc123

Cos90

Sin33

Answer 2

I'm sorry, but the equation you provided is incorrect. The correct equation should be:

cos(123) = cos(90 + 33)

To evaluate this equation, we need to understand that the cosine function is periodic, with a period of 360 degrees or 2π radians. This means that cos(x + 360) = cos(x) for any value of x.

In your equation, 123 degrees is greater than 90 degrees, so we can subtract 90 from 123 to find an equivalent angle within the range of 0 to 90 degrees:

123 - 90 = 33 degrees

So, we can rewrite the equation as:

cos(123) = cos(90 + 33) = cos(33)

Now, the claim you made that cos(123) = -sin(33) is not accurate. The cosine and sine functions are different, and their values are not equal. In general, cos(x) ≠ -sin(x).

To find the value of cos(33), you can use a calculator or a trigonometric table. The approximate value of cos(33) is 0.8387.