How to solve a simple sine equation: sin (theta) = 1/2.
How to write the vector equation of a line.
How to write an equation for the coordinate planes or any plane that is parallel to one.
How to write equations describing motion in a straight line given the velocity and the position when t=0.
How to write the parametric equations of a line segment that goes from point A to point B.
How to write the parametric equations of a circle centered at (0,0) with radius r, oriented counter-clockwise.