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This document is a Mac OS X manual page. Manual pages are a command-line technology for providing documentation. You can view these manual pages locally using the man(1) command. These manual pages come from many different sources, and thus, have a variety of writing styles. For more information about the manual page format, see the manual page for manpages(5). |
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. 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 9899:1999(E). BSD November 14, 2002 BSD |