What is the value of sin pi and cos pi?

The value of sin(π) is 0 and the value of cos(π) is -1.

To explain further, these values come from the unit circle in trigonometry. The angle π radians corresponds to 180 degrees, which is located on the negative x-axis of the unit circle. At this point, the coordinates are (-1, 0).

• sin(θ) represents the y-coordinate of the point on the unit circle, so sin(π) = 0.
• cos(θ) represents the x-coordinate, so cos(π) = -1.

Thus, the answers reflect the fundamental relationship between angles and coordinates on the unit circle.