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#1 2012-12-02 15:24:37

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

proof

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

2tan3Asec2A

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#2 2012-12-02 20:42:06

bob bundy
Moderator
Registered: 2010-06-20
Posts: 6,426

Re: proof

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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