How to derive two more cosine double-angle formulas.
How to graph y = tan(q) for one or more periods.
How to evaluate logarithms when the argument is a recognizable power of the base.
How to determine whether two matrices are inverses.
How graph the cotangent function using five key points.
How graph the secant function using five key points.
How to convert a system of linear equations into a matrix equation and solve it.