ACOS(3) | FreeBSD Library Functions Manual | ACOS(3) |
NAME
acos, acosf, acosl — arc cosine functionsLIBRARY
Math Library (libm, -lm)SYNOPSIS
#include < math.h> double
acos( double x);
float
acosf( float x);
long double
acosl( long double x);
DESCRIPTION
The acos(), acosf(), and acosl() functions compute the principal value of the arc cosine of x.RETURN VALUES
These functions return the arc cosine in the range [0, pi] radians. If:
|x| > 1,
acos( x) raises an invalid exception and returns an NaN.
SEE ALSO
asin(3), atan(3), atan2(3), cos(3), cosh(3), fenv(3), math(3), sin(3), sinh(3), tan(3), tanh(3)STANDARDS
The acos(), acosf(), and acosl() functions conform to ISO/IEC 9899:1999 (“ISO C99”).July 31, 2008 | FreeBSD |