acosh(3m) [opensolaris man page]

acosh(3M)						  Mathematical Library Functions						 acosh(3M)

NAME

       acosh, acoshf, acoshl - inverse hyperbolic cosine functions

SYNOPSIS

       c99 [ flag... ] file... -lm [ library... ]
       #include <math.h>

       double acosh(double x);

       float acoshf(float x);

       long double acoshl(long double x);

DESCRIPTION

       These functions compute the inverse hyperbolic cosine of their argument x.

RETURN VALUES

       Upon successful completion, these functions return the inverse hyperbolic cosine of their argument.

       For finite values of  x < 1, a domain error occurs and NaN is returned.

       If x is NaN, NaN is returned.

       If x is +1, +0 is returned.

       If x is +Inf, +Inf is returned.

       If x is -Inf, a domain error occurs and NaN is returned.

       For exceptional cases, matherr(3M) tabulates the values to be returned by acosh() as specified by SVID3 and XPG3.

ERRORS

       These functions will fail if:

       Domain Error    The x argument is finite and less than 1.0, or is -Inf.

		       If the integer expression (math_errhandling & MATH_ERREXCEPT) is non-zero, the invalid floating-point exception is raised.

		       The acosh() function sets errno to EDOM if x is less than 1.0.

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 acosh(). On return, if errno is non-zero, an error has occurred. The acoshf() and
       acoshl() 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

       cosh(3M), feclearexcept(3M), fetestexcept(3M), math.h(3HEAD), matherr(3M), attributes(5), standards(5)

SunOS 5.11							    12 Jul 2006 							 acosh(3M)

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

NAME

       cosh, coshf, coshl - hyperbolic cosine function

SYNOPSIS

       cc [ 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 5.10							    1 Sep 2002								  cosh(3M)