NAME

asin, asinf — arc sine function

LIBRARY

Math Library (libm, -lm)

SYNOPSIS

#include <math.h>

double
asin(double x);

float
asinf(float x);

DESCRIPTION

The asin() and asinf() functions compute the principal value of the arc sine of x in the range [-pi/2, +pi/2].

RETURN VALUES

If |x|>1, asin(x) and asinf(x) return NaN and set the global variable errno to EDOM.

SEE ALSO

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

STANDARDS

The asin() function conforms to ANSI X3.159-1989 (“ANSI C89”).