NAME
cosh, coshf, coshl - hyperbolic cosine function SYNOPSIS
#include
double cosh(double x); float coshf(float x); long double coshl(long double x); Link with -lm. Feature Test Macro Requirements for glibc (see featuretestmacros(7)): coshf(), coshl(): BSDSOURCE || SVIDSOURCE || XOPENSOURCE >= 600 || ISOC99SOURCE || POSIXCSOURCE >= 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 +HUGEVAL, +HUGEVALF, or +HUGEVALL, respectively. ERRORS See matherror(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 (FEOVERFLOW) 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. The variant returning double also conforms to SVr4, 4.3BSD. BUGS
In glibc version 2.3.4 and earlier, an overflow floating-point (FEOVERFLOW) exception is not raised when an overflow occurs. SEE ALSO acosh(3), asinh(3), atanh(3), ccos(3), sinh(3), tanh(3) COLOPHON
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2010-09-20 COSH(3)