Evaluate each of the following trig expressions without using a calculator. Homework Help ✎
Every point on the unit circle is defined as (cos (θ), sin (θ)).
Where is 180° on the unit circle?
Where is the y-value at that point?
See part (a).
When an angle is negative, it opens clockwise from 0° on the unit circle.
Find an equivalent angle between 0° and 360° by subtracting 510 − 360. Notice that the reference
triangle is a 30°-60°-90° triangle. Find the sin (30°).
What is the x-value in this location?