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




NAME

       acos - arc cosine function


SYNOPSIS

       #include <math.h>

       double acos(double x);


DESCRIPTION

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


RETURN VALUE

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


ERRORS

       EDOM   x is out of range.


CONFORMING TO

       SVID 3, POSIX, BSD 4.3, ISO 9899

SEE ALSO

asin, atan, atan2, cos, sin, tan, 
































                           June 8, 1993                         1

Top Master Index Keywords Functions

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