NAME

sinh, sinhf, cosh, coshf, tanh, tanhf, asinh, acosh, atanh - hyperbolic functions

SYNOPSIS

cc [flag ...] file ...  -lm [library ...]

#include <math.h>

double sinh (double x);

float sinhf (float x);

double cosh (double x);

float coshf (float x);

double tanh (double x);

float tanhf (float x);

double asinh (double x);

double acosh (double x);

double atanh (double x);

DESCRIPTION

sinh, cosh, and tanh and the single-precision versions sinhf, coshf, and tanhf return, respectively, the hyberbolic sine, cosine, and tangent of their argument.

asinh, acosh, and atanh return, respectively, the inverse hyperolic sine, cosine, and tangent of their argument.

SEE ALSO

matherr(3M).

DIAGNOSTICS

sinh, sinhf, cosh, and coshf return HUGE (and sinh and sinhf may return -HUGE for negative x) when the correct value would overflow and set errno to ERANGE.

acosh returns NaN and sets errno to EDOM when the argument x is less than 1. A message indicating DOMAIN error is printed on the standard error output.

atanh returns NaN and sets errno to EDOM if | x| > 1.  If  |
x|  =  1,  a message indicating SING error is printed on the
standard error output; if | x| > 1 the message will indicate
DOMAIN error.

Except when the -Xc compilation option is used, these error-handling procedures may be changed with the function matherr. When the -Xa or -Xc compilation options are used, HUGE_VAL is returned instead of HUGE and no error messages are printed.