Evaluate sin(150 degrees )

Problem

sin(150)

Solution

1. Identify the reference angle by finding the distance from the angle to the nearest x-axis. Since 150 is in the second quadrant, the reference angle is 180−150=30

2. Determine the sign of the sine function in the second quadrant. In the second quadrant, the sine of an angle is positive.

3. Apply the trigonometric identity sin(θ)=sin(180−θ) for angles in the second quadrant.

4. Evaluate the sine of the reference angle using the unit circle or special right triangles.

sin(30)=1/2

Final Answer

sin(150)=1/2

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