Find the Exact Value cos(270 degrees )

Problem

cos(270)

Solution

1. Identify the position of the angle 270 on the unit circle.

2. Determine the coordinates (x,y) at 270 which is located on the negative y-axis.

3. Recall that the coordinates for 270 are (0,−1)

4. Apply the definition of the cosine function on the unit circle, where cos(θ)=x

5. Substitute the x-coordinate into the function.

Final Answer

cos(270)=0

Want more problems? Check here!