ASIN(3)                     BSD Programmer's Manual                    ASIN(3)

NAME
     asin - arc sine function

SYNOPSIS
     #include <math.h>

     double
     asin(double x)

DESCRIPTION
     The asin() function computes the principal value of the arc sine of x. A
     domain error occurs for arguments not in the range [-1, +1].  For a dis-
     cussion of error due to roundoff, see math(3).

RETURN VALUES
     The asin() function returns the arc sine in the range [-pi/2, +pi/2] ra-
     dians.  On the VAX, and Tahoe , if:

           |x| > 1

     the global variable errno is set to EDOM and a reserved operand fault
     generated.

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

STANDARDS
     The asin() function conforms to ANSI C3.159-1989 (``ANSI C'').

BSDI BSD/386                    March 26, 1993                               1