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acos
Langue: en
Version: 2004-10-06 (mandriva - 22/10/07)
Section: 3 (Bibliothèques de fonctions)
NAME
acos, acosf, acosl - arc cosine functionSYNOPSIS
#include <math.h> double acos(double x); float acosf(float x); long double acosl(long double x);
Link with -lm.
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
SVr4, POSIX.1-2001, 4.3BSD, C89, C99. The float and long double variants are C99 requirements.SEE ALSO
asin(3), atan(3), atan2(3), cacos(3), cos(3), sin(3), tan(3)Contenus ©2006-2024 Benjamin Poulain
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