The Unit Circle
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All of trigonometry is based on the unit circle. So it is important for you to understand the following figure and commit it to memory.
The Unit Circle [ source: wikipedia ]
Here is a good video that shows where some of the information in this figure comes from.
video by Krista King Math |
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There is a lot of information here, so here is a video that help you remember what you need to.
video by PatrickJMT |
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Okay, so now you know the basics of trigonometry, right triangles and the unit circle. Next, let's take a look at some trig identities. Identities are equations that are true for every angle in a circle. There are many, many trig identities. On the next page, we list a few that are used a lot. You will need to commit these equations to memory. The best way to remember them is not to memorize them but to use them a lot in practice problems.
Really UNDERSTAND Precalculus
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