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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




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file: /Techref/language/ccpp/cref/man/acos.htm, 1KB, , updated: 2020/2/26 20:08, local time: 2020/6/2 14:14,
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