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## Homework Statement

What can we say about the evenness and oddness of the power spectrum (|F(s)|[itex]^{2}[/itex]) if the input fuction is purely real, purely imaginary or complex?

I know that a real function will give an even power spectrum. But I can't prove it!

## Homework Equations

F(s) = A(s)e[itex]^{j\Phi(s)}[/itex]

|F(s)|^2 = F(s).F*(s)

## The Attempt at a Solution

I'm stumped!