Manual Pages  — ASIN

asin, asinf, asinl – arc sine functions

LIBRARY SYNOPSIS DESCRIPTION RETURN VALUES SEE ALSO STANDARDS

Math Library (libm, -lm)

#include <math.h>

double
asin(double x);

float
asinf(float x);

long double
asinl(long double x);

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

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

 amp;|xamp;| > 1

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

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