acosh(3) [netbsd man page]

ACOSH(3)						   BSD Library Functions Manual 						  ACOSH(3)

NAME

     acosh, acoshf -- inverse hyperbolic cosine function

LIBRARY

     Math Library (libm, -lm)

SYNOPSIS

     #include <math.h>

     double
     acosh(double x);

     float
     acoshf(float x);

DESCRIPTION

     The acosh() and acoshf() functions compute the inverse hyperbolic cosine of the real argument x.

RETURN VALUES

     If x is less than one, acosh(x) and acoshf(x) return NaN and set the global variable errno to EDOM.

SEE ALSO

     asinh(3), atanh(3), exp(3), math(3)

HISTORY

     The acosh() function appeared in 4.3BSD.

BSD
								    May 6, 1991 							       BSD

ACOSH(3)						   BSD Library Functions Manual 						  ACOSH(3)

NAME

     acosh -- inverse hyperbolic cosine function

SYNOPSIS

     #include <math.h>

     double
     acosh(double x);

     long double
     acoshl(long double x);

     float
     acoshf(float x);

DESCRIPTION

     The acosh() function computes the principle value of the inverse hyperbolic cosine of x.  The result is in the range [0, +infinity].

SPECIAL VALUES

     acosh(1) returns +0.

     acosh(x) returns a NAN and raises the "invalid" floating-point exception for x < 1.

     acosh(+infinity) returns +infinity.

VECTOR OPERATIONS

     If you need to apply the acosh() function to SIMD vectors or arrays, using the following functions provided by the Accelerate.framework may
     give significantly better performance:

     #include <Accelerate/Accelerate.h>

     vFloat vacoshf(vFloat x);
     void vvacoshf(float *y, const float *x, const int *n);
     void vvacosh(double *y, const double *x, const int *n);

SEE ALSO

     asinh(3), atanh(3), exp(3), math(3)

STANDARDS

     The acosh() function conforms to ISO/IEC 9899:2011.

HISTORY

     The acosh() and acoshf() function appeared in 4.3BSD.

4.3 Berkeley Distribution					 December 11, 2006					 4.3 Berkeley Distribution