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ACOS(3) Library Functions Manual ACOS(3)

acos, acosf, acoslarc cosine functions

#include <math.h>

double
acos(double x);

float
acosf(float x);

long double
acosl(long double x);

The () function computes the principal value of the arc cosine of x in the range [0, pi]. The () is a single precision version of acos(). The () is an extended precision version of acos().

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

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

April 26, 2016 OpenBSD-current