GNU/Linux man pages
Livre :
Expressions régulières,
Syntaxe et mise en oeuvre :
GNU/Linux |
CentOS 4.8 |
i386 |
 |
acosl(3) |
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acos, acosf, acosl − arc cosine function
#include <math.h>
double
acos(double x);
float acosf(float x);
long double acosl(long double x);
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.
The acos() function returns the arc cosine in radians and the value is mathematically defined to be between 0 and PI (inclusive).
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EDOM |
x is out of range. |
SVID 3, POSIX, BSD 4.3, ISO 9899. The float and long double variants are C99 requirements.
asin(3), atan(3), atan2(3), cos(3), sin(3), tan(3)
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acosl(3) | |