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acosf(3) [netbsd man page]

ACOS(3) 						   BSD Library Functions Manual 						   ACOS(3)

NAME
acos, acosf -- arc cosine function LIBRARY
Math Library (libm, -lm) SYNOPSIS
#include <math.h> double acos(double x); float acosf(float x); DESCRIPTION
The acos() and acosf() functions compute the principal value of the arc cosine of x in the range [0, pi]. RETURN VALUES
If |x|>1, acos(x) and acosf(x) set the global variable errno to EDOM. SEE ALSO
asin(3), atan(3), atan2(3), cos(3), cosh(3), math(3), sin(3), sinh(3), tan(3), tanh(3) STANDARDS
The acos() function conforms to ANSI X3.159-1989 (``ANSI C89''). BSD
May 2, 1991 BSD

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ACOS(3) 						   BSD Library Functions Manual 						   ACOS(3)

NAME
acos -- arc cosine function SYNOPSIS
#include <math.h> double acos(double x); long double acosl(long double x); float acosf(float x); DESCRIPTION
The acos() function computes the principle value of the arc cosine of x. The result is in the range [0, pi]. SPECIAL VALUES
acos(1) returns +0. acos(x) returns a NAN and raises the "invalid" floating-point exception for |x| > 1. VECTOR OPERATIONS
If you need to apply the acos() 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 vacosf(vFloat x); void vvacosf(float *y, const float *x, const int *n); void vvacos(double *y, const double *x, const int *n); SEE ALSO
sin(3), cos(3), tan(3), asin(3), atan(3), atan2(3), sinh(3), cosh(3), tanh(3), math(3) STANDARDS
The acos() function conforms to ISO/IEC 9899:2011. BSD
December 11, 2006 BSD
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