acos(3) - NetBSD Manual Pages

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ACOS(3)                 NetBSD Library Functions Manual                ACOS(3)


NAME
acos, acosf, acosl -- arc cosine function
LIBRARY
Math Library (libm, -lm)
SYNOPSIS
#include <math.h> double acos(double x); float acosf(float x); long double acosl(long double x);
DESCRIPTION
The acos(), acosf(), and acosl() functions compute the principal value of the arc cosine of x in the range [0, pi].
RETURN VALUES
If |x|>1, acos(x), acosf(x), and acosl(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 ISO/IEC 9899:1999 (``ISO C99''). NetBSD 9.2 January 29, 2013 NetBSD 9.2
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