What is the easy way to remember the formula identities function, double angle, half angle, etc.?

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- Mar 16th 2010, 10:42 PMAnemoritrig identities formula
What is the easy way to remember the formula identities function, double angle, half angle, etc.?

- Mar 16th 2010, 11:36 PMpickslides
Do lots and lots of problems involving such identities.