## Linux and UNIX Man Pages

Test Your Knowledge in Computers #702
Difficulty: Medium
The MySQL LIKE operator is a logical operator that tests whether a string contains a specified pattern.
True or False?

# tanh(3) [freebsd man page]

```TANH(3) 						   BSD Library Functions Manual 						   TANH(3)

NAME
tanh, tanhf, tanhl -- hyperbolic tangent functions

LIBRARY
Math Library (libm, -lm)

SYNOPSIS
#include <math.h>

double
tanh(double x);

float
tanhf(float x);

long double
tanhl(long double x);

DESCRIPTION
The tanh(), tanhf(), and tanhl() functions compute the hyperbolic tangent of x.  For a discussion of error due to roundoff, see math(3).

RETURN VALUES
The tanh(), tanhf(), and the tanhl() functions return the hyperbolic tangent value.

acos(3), asin(3), atan(3), atan2(3), cos(3), cosh(3), ctanh(3), math(3), sin(3), sinh(3), tan(3)

STANDARDS
The tanh() function conforms to ISO/IEC 9899:1990 (``ISO C90'').

BSD								  August 17, 2013							       BSD```

## Check Out this Related Man Page

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

NAME
tanh, tanhf, tanhl - hyperbolic tangent function

SYNOPSIS
#include <math.h>

double tanh(double x);
float tanhf(float x);
long double tanhl(long double x);

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

tanhf(), tanhl(): _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE; or cc -std=c99

DESCRIPTION
The tanh() function returns the hyperbolic tangent of x, which is defined mathematically as:

tanh(x) = sinh(x) / cosh(x)

RETURN VALUE
On success, these functions return the hyperbolic tangent 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), +1 (-1) is returned.

ERRORS
No errors occur.

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