In class on December 2nd we learned about the Sum and Difference identities. (Note: a large portion of these notes show how we derived the identities given angles and prior knowledge of the unit circle.)
The identities allow us to find the sine, cosine, and tangent of angles we previously could not (ie: 15 degrees), by adding or subtracting (ie: 60-45=15) using angles for which we can already find the trig functions.
The identities allow us to find the sine, cosine, and tangent of angles we previously could not (ie: 15 degrees), by adding or subtracting (ie: 60-45=15) using angles for which we can already find the trig functions.
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