## Linux and UNIX Man Pages

Test Your Knowledge in Computers #619
Difficulty: Medium
In Python, variables may not be used by just assigning them a value. Declaration and data type definition is required in Python.
True or False?

# sinh(3) [linux man page]

```SINH(3) 						     Linux Programmer's Manual							   SINH(3)

NAME
sinh, sinhf, sinhl - hyperbolic sine function

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():
_BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L;
or cc -std=c99

DESCRIPTION
The sinh() function returns 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:

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

CONFORMING TO
C99, POSIX.1-2001.  The variant returning double also conforms to SVr4, 4.3BSD, C89.

acosh(3), asinh(3), atanh(3), cosh(3), csinh(3), tanh(3)

COLOPHON
This page is part of release 3.27 of the Linux man-pages project.  A description of the project, and information about reporting bugs,  can
be found at http://www.kernel.org/doc/man-pages/.

2010-09-20								   SINH(3)```

## Check Out this Related Man Page

```COSH(3) 						     Linux Programmer's Manual							   COSH(3)

NAME
cosh, coshf, coshl - hyperbolic cosine function

SYNOPSIS
#include <math.h>

double cosh(double x);
float coshf(float x);
long double coshl(long double x);

Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

coshf(), coshl():
_ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
|| /* Since glibc 2.19: */ _DEFAULT_SOURCE
|| /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE

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

cosh(x) = (exp(x) + exp(-x)) / 2

RETURN VALUE
On success, these functions return the hyperbolic cosine of x.

If x is a NaN, a NaN is returned.

If x is +0 or -0, 1 is returned.

If x is positive infinity or negative infinity, positive infinity is returned.

If the result overflows, a range error occurs, and the functions return +HUGE_VAL, +HUGE_VALF, or +HUGE_VALL, respectively.

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:

Range error: result overflow
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   |
+-------------------------+---------------+---------+
|cosh(), coshf(), coshl() | Thread safety | MT-Safe |
+-------------------------+---------------+---------+
CONFORMING TO
C99, POSIX.1-2001, POSIX.1-2008.

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

BUGS
In glibc version 2.3.4 and earlier, an overflow floating-point (FE_OVERFLOW) exception is not raised when an overflow occurs.