__Function:__int**gsl_integration_qawc***(gsl_function **`f`, double`a`, double`b`, double`c`, double`epsabs`, double`epsrel`, size_t`limit`, gsl_integration_workspace *`workspace`, double *`result`, double *`abserr`)-
This function computes the Cauchy principal value of the integral of @math{f} over @math{(a,b)}, with a singularity at

`c`,The adaptive bisection algorithm of QAG is used, with modifications to ensure that subdivisions do not occur at the singular point @math{x = c}. When a subinterval contains the point @math{x = c} or is close to it then a special 25-point modified Clenshaw-Curtis rule is used to control the singularity. Further away from the singularity the algorithm uses an ordinary 15-point Gauss-Kronrod integration rule.

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