# Solving Tan(A) + tan(B) + tan(C)

1. Nov 8, 2011

### shinnsohai

Recently My friend gave me a question about trigo

1. The problem statement, all variables and given/known data

How do I Solve This?
Tan(A) + tan(B) + tan(C)

On My Own Thought
Maybe I Think That The Question Is Quite Incomplete

2. The attempt at a solution

Any Idea To Start The Calculation?

2. Nov 8, 2011

### Staff: Mentor

Tan(A) + tan(B) + tan(C)
is not an equation, so has no "solution".

3. Nov 8, 2011

### eumyang

Perhaps the question was something like this?
Prove that if A, B and C are the 3 angles in a triangle,
$\tan A + \tan B + \tan C = (\tan A)(\tan B)(\tan C)$

4. Nov 9, 2011

### Staff: Mentor

If your hunch is correct, then I'm sure there will be plenty of solutions to be found by a google search.