Trig Identities

We've already encountered several of these identities:
Example exercises: pp. 498--, #3, 21
In some cases we're just trying to show that one trig expression is the same as another: here's the strategy suggested by our author:
Example exercises: pp. 498--, #27, 53, 79, 81
Here are the two most important identities:
Example exercises: pp. 505--, #3, 9, 51
and here's a formula for turning sums of sines and cosines into a single sine function:
Example exercises: pp. 505--, #55, 59

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