sinh(3) Library Functions Manual sinh(3)

# NAME

sinh, sinhf, sinhl - hyperbolic sine function

# LIBRARY

Math library (libm, -lm)

# SYNOPSIS

`#include <math.h>`
```double sinh(double x);
float sinhf(float x);
long double sinhl(long double x);```
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

sinhf(), sinhl():

```
_ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L

|| /* Since glibc 2.19: */ _DEFAULT_SOURCE

|| /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE```

# DESCRIPTION

These functions return the hyperbolic sine of x, which is defined mathematically as:

```
sinh(x) = (exp(x) - exp(-x)) / 2```

# RETURN VALUE

On success, these functions return the hyperbolic sine of x.

If x is a NaN, a NaN is returned.

If x is +0 (-0), +0 (-0) is returned.

If x is positive infinity (negative infinity), positive infinity (negative infinity) is returned.

If the result overflows, a range error occurs, and the functions return HUGE_VAL, HUGE_VALF, or HUGE_VALL, respectively, with the same sign as x.

# ERRORS

See math_error(7) for information on how to determine whether an error has occurred when calling these functions.

The following errors can occur:

errno is set to ERANGE. An overflow floating-point exception (FE_OVERFLOW) is raised.

# ATTRIBUTES

For an explanation of the terms used in this section, see attributes(7).

 Interface Attribute Value sinh (), sinhf (), sinhl () Thread safety MT-Safe

# STANDARDS

C11, POSIX.1-2008.

# HISTORY

C99, POSIX.1-2001.

The variant returning double also conforms to SVr4, 4.3BSD, C89.