คำตอบ - Trigonometry

The period of trigonometric functions is 360 degrees.

$$\sin \left(1180°\right)=\sin \left(1180-360°\right)$$

Subtracting one integer from another.

$$\sin \left(1180-360°\right)=\sin \left(820°\right)$$

The period of trigonometric functions is 360 degrees.

$$\sin \left(820°\right)=\sin \left(820-360°\right)$$

Subtracting one integer from another.

$$\sin \left(820-360°\right)=\sin \left(460°\right)$$

The period of trigonometric functions is 360 degrees.

$$\sin \left(460°\right)=\sin \left(460-360°\right)$$

Subtracting one integer from another.

$$\sin \left(460-360°\right)=\sin \left(100°\right)$$

Reflecting the number with respect to 360 degrees.

$$\sin \left(100°\right)=\sin \left(180-80°\right)$$

Reflecting the sine function with respect to 180 degrees.

$$\sin \left(180-80°\right)=\sin \left(80°\right)$$