# Math Help - Trig Proofs (Even, Odd, Neither)

1. ## Trig Proofs (Even, Odd, Neither)

I need to write a proof showing that h(x) is either odd, even, or neither.

Assume h(x) = f(x)*g(x) and f(x) is even and g(x) is odd.

I think the first step would be substituting as follows: h(x)=f(-x)*-g(x) because of the def'n of even and odd functions.

This is where I am stuck and don't know how to proceed.

Any help is appreciated

2. ## Re: Trig Proofs (Even, Odd, Neither)

A function is even if f(-x) = f(x)
A function is odd if -f(x) = f(-x)
Now, h(-x) = f(-x)g(-x)

Now g(x) is odd, so g(-x) = -g(x)
Now f(x) is even so f(-x) = f(x) ...

so h(-x) = ...