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**shidubravin****Member**- Registered: 2012-12-02
- Posts: 1

(tan4A+tan2A)(1 - tan23A tan2A) = 2tan3A sec2A

2tan3Asec2A

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**bob bundy****Moderator**- Registered: 2010-06-20
- Posts: 6,092

hi shidubravin

Welcome to the forum.

(tan4A+tan2A)(1 - tan23A tan2A) = 2tan3A sec2A

Did you mean 23A here ? substituting A = 10 gives a LHS ≠ RHS.

please check your identity.

Also, you have posted in the exercises section => you are challenging us to find the solution you already know.

Did you want it in the help section => you want someone to help you to do the problem ?

Bob

You cannot teach a man anything; you can only help him find it within himself..........Galileo Galilei

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