Final answer:
The exact value of sin(-π) is -1.
Step-by-step explanation:
The exact value of sin(-π) can be found by using the unit circle. The unit circle is a circle with a radius of 1 and its center at the origin of a coordinate plane. Since sin is a periodic function with a period of 2π, sin(-π) is the same as sin(π), which corresponds to the y-coordinate of the point on the unit circle that is π units counter-clockwise from the positive x-axis.
On the unit circle, π is 180 degrees. At this angle, the y-coordinate is -1, so sin(-π) is equal to -1.