Řešení - Trigonometry

The period of trigonometric functions is 360 degrees.

$$\cos \left(450°\right)=\cos \left(450-360°\right)$$

Subtracting one integer from another.

$$\cos \left(450-360°\right)=\cos \left(90°\right)$$

Computing the cosine of 90 degrees.

$$\cos \left(90°\right)=0$$