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GNU Scientific Library Reference Manual - Third Edition (v1.12)
by M. Galassi, J. Davies, J. Theiler, B. Gough, G. Jungman, P. Alken, M. Booth, F. Rossi
Paperback (6"x9"), 592 pages, 60 figures
ISBN 0954612078
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7.31.3 Hyperbolic Trigonometric Functions

Function: double gsl_sf_lnsinh (double x)
Function: int gsl_sf_lnsinh_e (double x, gsl_sf_result * result)
These routines compute \log(\sinh(x)) for x > 0.
Function: double gsl_sf_lncosh (double x)
Function: int gsl_sf_lncosh_e (double x, gsl_sf_result * result)
These routines compute \log(\cosh(x)) for any x.
ISBN 0954612078GNU Scientific Library Reference Manual - Third Edition (v1.12)See the print edition