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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  feclearex‐
       cept(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),	 stan‐
       dards(5)

SunOS 5.11			  12 Jul 2006			      cosh(3M)
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