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How to find exact value of sin(-π)?

User Stiig
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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.

User Drew Hall
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