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cosh(3) [linux 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); Link with -lm. Feature Test Macro Requirements for glibc (see feature_test_macros(7)): coshf(), coshl(): _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L; or cc -std=c99 DESCRIPTION
The cosh() function returns 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. CONFORMING TO
C99, POSIX.1-2001. 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. SEE ALSO
acosh(3), asinh(3), atanh(3), ccos(3), sinh(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 COSH(3)

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cosh(3M)						  Mathematical Library Functions						  cosh(3M)

NAME
cosh, coshf, coshl - hyperbolic cosine function SYNOPSIS
c99 [ flag... ] file... -lm [ library... ] #include <math.h> double cosh(double x); float coshf(float x); long double coshl(long double x); DESCRIPTION
These functions compute the hyperbolic cosine of their argument x. RETURN VALUES
Upon successful completion, these functions return the hyperbolic cosine of x. If the correct value would cause overflow, a range error occurs and cosh(), coshf(), and coshl() return the value of the macro HUGE_VAL, HUGE_VALF, and HUGE_VALL, respectively. If x is NaN, a NaN is returned. If x is +-0, 1.0 is returned. If x is +-Inf, +-Inf is returned. For exceptional cases, matherr(3M) tabulates the values to be returned by cosh() as specified by SVID3 and XPG3. ERRORS
These functions will fail if: Range Error The result would cause an overflow. If the integer expression (math_errhandling & MATH_ERREXCEPT) is non-zero, the overflow floating-point exception is raised. The cosh() function sets errno to ERANGE if the result would cause an overflow. USAGE
An application wanting to check for exceptions should call feclearexcept(FE_ALL_EXCEPT) before calling these functions. On return, if fetestexcept(FE_INVALID | FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW) is non-zero, an exception has been raised. An application should either examine the return value or check the floating point exception flags to detect exceptions. An application can also set errno to 0 before calling cosh(). On return, if errno is non-zero, an error has occurred. The coshf() and coshl() functions do not set errno. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ |MT-Level |MT-Safe | +-----------------------------+-----------------------------+ SEE ALSO
acosh(3M), feclearexcept(3M), fetestexcept(3M), isnan(3M), math.h(3HEAD), matherr(3M), sinh(3M), tanh(3M), attributes(5), standards(5) SunOS 5.11 12 Jul 2006 cosh(3M)

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