Common Trigonometry Mistakes
Example: Simplifying an Expression 
Sometimes a problem produces numerous mistakes. This one produced enough to justify breaking the mistakes into several separate pages. The Context
This was a test question. Verify the identity: For the purposes of these web pages the task is phrased as "Simplify the Expression". That's how I teach students to approach identity verification problems: simplify one side of the identity to the other (or simplify both sides separately to the same expression). Continue on to the Mistakes: 
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