Trigonometric Identities: How to Derive / Remember Them – Part 1 of 3

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Trigonometric Identities: How to Derive / Remember Them – Part 1 of 3.
The dreaded trig identities!! Oh no!
Here are some ways that I remember the trig identities. I just remember a couple and derive the rest from those! Very little memorization is required. It works for me, so hopefully it will also work for you.

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