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How to do integration symbolically with cauchy principal values


Dear everyone,
I meet a cauchy integration when calculating optical functions with
Kramers-Kronig integration:
\!\(\(ϵ\_1\) \((x)\) =
        constant + \(2\/Ï?\) P \(â?«\_x0\%â??\(\( ξ*\(ϵ\_2\)
\((ξ)\)\)\/\(ξ\^2 -
         x\^2\)\) \[DifferentialD]ξ\)\)
How to do it symbolically in Mathematica?
And how to develope software with Mathematica with interfaces like VC++
?


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