คำตอบ - Trigonometry

The period of trigonometric functions is 360 degrees.

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

Subtracting one integer from another.

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

Computing the sine of 90 degrees.

$$\sin \left(90°\right)=1$$