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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
- Administrator
- Registered: 2010-06-20
- Posts: 10,646
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
Children are not defined by school ...........The Fonz
You cannot teach a man anything; you can only help him find it within himself..........Galileo Galilei
Sometimes I deliberately make mistakes, just to test you! …………….Bob 
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