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Mathematical Library Functionscosh(3M)


NAME

 cosh - hyperbolic cosine function

SYNOPSIS

 
cc [ flag ... ] file ... -lm [ library ... ]
#include <math.h>
double cosh(double x);

DESCRIPTION

 

The cosh() function computes the hyperbolic cosine of x.

RETURN VALUES

 

Upon successful completion, cosh() returns the hyperbolic cosine of x.

If the result would cause an overflow, HUGE_VAL is returned and errno is set to ERANGE.

If x is NaN, NaN is returned.

For exceptional cases, matherr(3M) tabulates the values to be returned as dictated by Standards other than XPG4.

ERRORS

 

The cosh() function will fail if:

ERANGE
The result would cause an overflow.

USAGE

 

An application wishing to check for error situations should set errno to 0 before calling cosh(). If errno is non-zero on return, or the returned value is NaN, an error has occurred.

ATTRIBUTES

 

See attributes(5) for descriptions of the following attributes:

ATTRIBUTE TYPEATTRIBUTE VALUE
MT-LevelMT-Safe

SEE ALSO

 

acosh(3M), isnan(3M), matherr(3M), sinh(3M), tanh(3M), attributes(5), standards(5)


SunOS 5.9Go To TopLast Changed 29 Dec 1996

 
      
      
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