Proving Trigonometric Identities Using the Unit Circle – An Example

I tried to work up a complete example of how to prove a trigonometric identity using the unit circle.  The proof below could have more explanation.  Understanding it requires careful scrutiny.

Unit Circle Proof

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About jrh794

I am a sixty-five year old math instructor at Southern Oregon University. I taught at the College of the Siskiyous in Weed California for twenty-six years. Prior to that I worked as a computer programmer, carpenter and in various other jobs. I graduated from Rice University in 1967 and have a MS in Operations Research from Stanford. In the past I have hand-built a stone house and taken long solo bicycle tours. Now I ride my mountain bike and play golf for recreation.
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