Students will learn how to determine whether each of the six basic trig functions are positive or negative for a given angle. For the first quadrant, all trig functions are positive. For the second quadrant, sin and csc are positive. For the third quadrant, tan and cot are positive. For the fourth quadrant, cos and sec are positive. This can be memorized using the mnemonic *all stations to central,* *all students take calculus,* or *all students take cocaine,* where *a = all, s = sine, t = tan, c = calculus.* Here's a good lesson, which also includes some basic problems. Next, students will use this knowledge to solve basic trig equations. For example, solve \(\sin x = -\sqrt{3}/2.\) For a lesson, watch this, then this, then this, then this.