Name

asin, asinf, asinl — arc sine function

Synopsis

#include <math.h>
double asin( double   x);
float asinf( float   x);
long double asinl( long double   x);
[Note] Note

Link with −lm.

DESCRIPTION

The asin() function calculates the arc sine of x; that is the value whose sine is x. If x falls outside the range −1 to 1, asin() fails and errno is set.

RETURN VALUE

The asin() function returns the arc sine in radians and the value is mathematically defined to be between −PI/2 and PI/2 (inclusive).

ERRORS

EDOM

x is out of range.

CONFORMING TO

SVr4, POSIX.1-2001, 4.3BSD, C89, C99. The float and long double variants are C99 requirements.

SEE ALSO

acos(3), casin(3), atan(3), atan2(3), cos(3), sin(3), tan(3)

COLOPHON

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