help deriving this identity. thank you

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- November 20th 2008, 08:48 PMjvignacioderive identity help

help deriving this identity. thank you - November 20th 2008, 08:51 PMChris L T521
- November 20th 2008, 10:08 PMjvignacio
- November 21st 2008, 09:54 AMKrizalid
Those are basic ones, better you review some of trig.

- November 21st 2008, 10:06 AMMath_Helper