how to i solve this equation?

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- November 23rd 2009, 08:35 PM>_<SHY_GUY>_<multiple angle equations

how to i solve this equation? - November 23rd 2009, 09:53 PMqmechFirst solve...
First solve:

Then solve

- November 23rd 2009, 09:59 PMbigwave

check

- November 23rd 2009, 09:59 PM>_<SHY_GUY>_<
- November 23rd 2009, 10:15 PMbigwave
this is double angle formula...

to check x plug it back into the original equation....