What you need to know
Up to this point, we’ve let our calculators do the heavy lifting when it comes to evaluating the 3 trig functions, but there are some values of the trig functions that you have to remember. Specifically, you will have to remember sin, cos, and tan of 0\degree, 30\degree, 45\degree, 60\degree, and 90\degree. The values are outlined in the table on the right.
There are a lot of values here, but also a lot of repeats. A good tip for sin and cos is: if you have two angles that add up to 90, e.g. 60 and 30, then the sin of one will be the same as the cos of another.
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