👉 Learn how to graph a cosine function. To graph a cosine function, we first determine the amplitude (the maximum point on the graph), the period (the distance/time for a complete oscillation), the ...

👉 Learn all about sum and difference angle identities. In this video playlist, you will learn how to evaluate, solve, simplify and verify using sum and difference angle identities. We will evaluate ...

This all started with a student my wife was helping with high school trigonometry homework. Here is one of the questions. Here is the solution that the homework was looking for: This uses the ...