Evaluate sin(-180 degrees )

Problem

sin(−180)

Solution

1. Identify the angle in the unit circle. The angle −180 represents a clockwise rotation of 180 from the positive x-axis.

2. Determine the terminal side of the angle. A rotation of −180 lands on the negative x-axis, which is the same position as 180

3. Find the coordinates on the unit circle. The point on the unit circle corresponding to −180 is (−1,0)

4. Apply the definition of the sine function. In the unit circle, sin(θ) is equal to the y-coordinate of the point.

5. Evaluate the expression. Since the y-coordinate is 0 the value of the sine function is 0

Final Answer

sin(−180)=0

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