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Clausen functions as per the Gnu Scientific Library section 7.6. These functions are declared in header file gsl_sf_clausen.h
gsl_sf_clausen.h
clausen(x, give=FALSE, strict=TRUE)
input: real values
Boolean with TRUE meaning to return a list of three items: the value, an estimate of the error, and a status number
TRUE
Boolean, with TRUE meaning to return NaN if status is an error
NaN
Robin K. S. Hankin
https://www.gnu.org/software/gsl/
x <- (0:30)*pi/180 clausen(x) #table 27.8, p1006
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