1ACOS(3)                    Linux Programmer's Manual                   ACOS(3)
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NAME

6       acos, acosf, acosl - arc cosine function
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SYNOPSIS

9       #include <math.h>
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11       double acos(double x);
12       float acosf(float x);
13       long double acosl(long double x);
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15       Link with -lm.
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DESCRIPTION

18       The  acos()  function calculates the arc cosine of x; that is the value
19       whose cosine is x.  If x falls outside the range -1 to 1, acos()  fails
20       and errno is set.
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RETURN VALUE

23       The  acos() function returns the arc cosine in radians and the value is
24       mathematically defined to be between 0 and PI (inclusive).
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ERRORS

27       EDOM   x is out of range.
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CONFORMING TO

30       SVr4, POSIX.1-2001, 4.3BSD, C89, C99.  The float and long double  vari‐
31       ants are C99 requirements.
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SEE ALSO

34       asin(3), atan(3), atan2(3), cacos(3), cos(3), sin(3), tan(3)
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38                                  2004-10-06                           ACOS(3)
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