Help with a problem from Atkins Molecular Quantum Chemistry

Hi all,

Problem

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Show that if $\displaystyle ( /Omega f )* = - /Omega f* $, then $\displaystyle < /Omega > = 0 $ for any real function $\displaystyle f $

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This is probably disgustingly simple, but it has me stumped :(

Sorry for the presentation, can anyone show me how to use TeX equations in my post? I am new to the forums.