NAME

sinh, cosh, tanh, sinhcosh − Hyperbolic functions

LIBRARY

Math Library (libm.a)

SYNOPSIS

#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 sinhcosh  (double x);
float  sinhcoshf (float  x);

STANDARDS

Interfaces documented on this reference page conform to industry standards as follows:

cosh():  XPG4

sinh():  XPG4

tanh():  XPG4

Refer to the standards(5) reference page for more information about industry standards and associated tags. 

DESCRIPTION

The sinh() and sinhf() functions compute the hyperbolic sine of x.  Both sinh(x) and sinhf(x) are defined as (exp(x) − exp(−x))/2. 

The cosh()  and coshf() functions compute the hyperbolic cosine of x.  Both cosh(x) and coshf(x) are defined as (e∗∗x + e∗∗(−x))/2. 

The tanh() and tanhf() functions compute the hyperbolic tangent of x.  Both tanh(x) and tanhf(x) are defined as (e∗∗x − e∗∗(−x))/(e∗∗x + e∗∗(−x)). 

The sinhcosh()  and sinhcoshf() functions compute both the hyperbolic sine and hyperbolic cosine of x.  Both sinhcosh(x) and sinhcoshf(x) are defined as sinh x + icosh x. 

The following table describes function behavior in response to exceptional arguments:

The following table lists boundary values used by these functions: