Arctangent Integral - GNU Scientific Library -- Reference Manual
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#### 7.17.6 Arctangent Integral

— Function: double gsl_sf_atanint (double x)
— Function: int gsl_sf_atanint_e (double x, gsl_sf_result * result)

> These routines compute the Arctangent integral, which is defined as AtanInt(x) = \int_0^x dt \arctan(t)/t.

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