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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. RossiPaperback (6"x9"), 592 pages, 60 figuresISBN 0954612078RRP £24.95 (\$39.95)

## 5.5 Complex Trigonometric Functions

Function: gsl_complex gsl_complex_sin (gsl_complex z)
This function returns the complex sine of the complex number z, \sin(z) = (\exp(iz) - \exp(-iz))/(2i).
Function: gsl_complex gsl_complex_cos (gsl_complex z)
This function returns the complex cosine of the complex number z, \cos(z) = (\exp(iz) + \exp(-iz))/2.
Function: gsl_complex gsl_complex_tan (gsl_complex z)
This function returns the complex tangent of the complex number z, \tan(z) = \sin(z)/\cos(z).
Function: gsl_complex gsl_complex_sec (gsl_complex z)
This function returns the complex secant of the complex number z, \sec(z) = 1/\cos(z).
Function: gsl_complex gsl_complex_csc (gsl_complex z)
This function returns the complex cosecant of the complex number z, \csc(z) = 1/\sin(z).
Function: gsl_complex gsl_complex_cot (gsl_complex z)
This function returns the complex cotangent of the complex number z, \cot(z) = 1/\tan(z).
 ISBN 0954612078 GNU Scientific Library Reference Manual - Third Edition (v1.12) See the print edition