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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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