How to evaluate the tangent of 3*pi/4.
How to calculate the circumference of a circle.
How to predict the hybridization of atomic orbitals.
How do we measure sine and cosine of pi/4?
How to graph y = tan(theta) for 0 <= theta < pi/2.
How graph the cotangent function using five key points.
How graph the secant function using five key points.