NAME

asin, asinf, asinl — arc sine functions

LIBRARY

Math Library (libm, -lm)

SYNOPSIS

#include <math.h>

double
asin(double x);

float
asinf(float x);

long double
asinl(long double x);

DESCRIPTION

The asin(), asinf(), and asinl() functions compute the principal value of the arc sine of x.

RETURN VALUES

These functions return the arc sine in the range [-pi/2, +pi/2] radians. If:

|x| > 1

asin(x) raises an invalid exception and returns an NaN.

SEE ALSO

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

STANDARDS

The asin(), asinf(), and asinl() functions conform to ISO/IEC 9899:1999 (“ISO C99”).