How to derive the equation for the distance between two points using the Pythagorean Theorem.
How to identify the graph of a stretched cosine curve.
How graph the cotangent function using five key points.
How graph the secant function using five key points.
How to simplify square roots using two different methods.
How to calculate the area of any triangle using two sides and an included angle.
How to derive two more cosine double-angle formulas.