ACOS(3)

NAME
acos - arc cosine function

LIBRARY
libm

SYNOPSIS
#include <math.h>
double
acos(double x);
float
acosf(float x);

DESCRIPTION
The acos() and acosf() functions compute the principal value of the arc cosine of x in the range [0,].

RETURN VALUES
If |x|>1, acos(x) and acosf(x) set the global variable errno to EDOM.

SEE ALSO
sin(3), cos(3), tan(3), asin(3), atan(3), atan2(3), sinh(3), cosh(3), tanh(3), math(3)

STANDARDS
The acos() function conforms to ansiC.