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[itex]\Gamma[/itex](t) is a function that i can know only at dicrete points and appears in this integral:

[itex]\int[/itex][itex]\Gamma[/itex](t) * tan ([itex]\Gamma(t)[/itex]*t + [itex]\varphi[/itex])

My question is now, which could be the best interpolation of [itex]\Gamma[/itex](t) that would allopw an exact integration?

Thank you very much in advance

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# Interpolation for numerical integration

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