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General solution of tantheta+tan4theta+t...

General solution of `tantheta+tan4theta+tan7theta=tanthetatan4thetatan7theta` is `theta=(npi)/(12),w h e rn in Z` `theta=(npi)/9,w h e rn in Z` `theta=npi+pi/(12),w h e rn in Z` `non eoft h e s e`

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