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acosh(3) [opendarwin man page]

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

NAME
acosh -- inverse hyperbolic cosine function SYNOPSIS
#include <math.h> double acosh(double x); DESCRIPTION
The acosh() function computes the inverse hyperbolic cosine of the real argument x. 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. SEE ALSO
asinh(3), atanh(3), exp(3), infnan(3), math(3), matherr(3) STANDARDS
The acosh() function conforms to ISO/IEC 9899:1999(E). HISTORY
The acosh() function appeared in 4.3BSD. 4.3 Berkeley Distribution November 15, 2002 4.3 Berkeley Distribution

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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
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