Evaluate each of the following trig expressions without using a calculator.
Every point on the unit circle is defined as
on the unit circle?
Where is the
value at that point?
See part (a).
When an angle is negative, it opens clockwise from
on the unit circle.
Find an equivalent angle between
by subtracting . Notice that the reference triangle is a triangle. Find the .
What is the
value in this location?
Remember the tangent is the ratio of