COSH(3) BSD Library Functions Manual COSH(3)NAME
cosh, coshf -- hyperbolic cosine function
LIBRARY
Math Library (libm, -lm)
SYNOPSIS
#include <math.h>
double
cosh(double x);
float
coshf(float x);
DESCRIPTION
The cosh() and coshf() functions compute the hyperbolic cosine of x.
RETURN VALUES
If the magnitude of x is too large, cosh(x) and coshf(x) return Inf and sets the global variable errno to ERANGE.
SEE ALSO acos(3), asin(3), atan(3), atan2(3), cos(3), math(3), sin(3), sinh(3), tan(3), tanh(3)STANDARDS
The cosh() function conforms to ANSI X3.159-1989 (``ANSI C89'').
BSD May 2, 1991 BSD
Check Out this Related Man Page
sinh(3) Library Functions Manual sinh(3)NAME
sinh, cosh, tanh - Hyperbolic functions
LIBRARY
Math Library (libm.a)
SYNOPSIS
#include <math.h>
double sinh (double x); float sinhf (float x); long double sinhl (long double x); double cosh (double x); float coshf (float x);
long double coshl (long double x); double tanh (double x); float tanhf (float x); long double tanhl (long double 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(), sinhf(), and sinhl() functions compute the hyperbolic sine of x. Both sinh(x), sinhf(x), and sinhl(x) are defined as (exp(x) -
exp(-x))/2.
The cosh(), coshf(), and coshl() functions compute the hyperbolic cosine of x. Both cosh(x), coshf(x), and coshl(x) are defined as (e**x
+ e**(-x))/2.
The tanh(), tanhf(), and tanhl() functions compute the hyperbolic tangent of x. Both tanh(x), tanhf(x), and tanhl(x) are defined as (e**x
- e**(-x))/(e**x + e**(-x)).
The following table describes function behavior in response to exceptional arguments:
--------------------------------------------------------------------
Function Exceptional Argument Routine Behavior
--------------------------------------------------------------------
sinh(), sinhf(), sinhl() |x|>ln(2 * max_float) Overflow
cosh(), coshf(), coshl() |x|>ln(2 * max_float) Overflow
--------------------------------------------------------------------
The following table lists boundary values used by these functions:
---------------------------------------------------------------------
Value Name Data Type Hexadecimal Value Decimal Value
---------------------------------------------------------------------
ln(2 * max_float) S_FLOAT 42B2D4FC 89.41599
T_FLOAT 408633CE8FB9F87E 710.475860073943
---------------------------------------------------------------------
delim off
sinh(3)
Introduction
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