How to evaluate the tangent of 3*pi/4.
How do we measure sine and cosine of pi/4?
How to measure the sine and cosine of 150.
How to describe the unit circle. How to draw the unit circle and label its parts. How to strategize about finding coordinates on the unit circle.
How to evaluate expressions like tan(sin (4/5))^(-1).
How to simplify square roots using two different methods.