The Clausen function is defined by the following integral,
It is related to the dilogarithm by @math{Cl_2(\theta) = \Im Li_2(\exp(i
\theta))}. The Clausen functions are declared in the header file
``gsl_sf_clausen.h'`.

__Function:__double**gsl_sf_clausen***(double*`x`)__Function:__int**gsl_sf_clausen_e***(double*`x`, gsl_sf_result *`result`)- These routines compute the Clausen integral @math{Cl_2(x)}.

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