NAME
    asin - arc sine

SYNOPSIS
    asin(x [,acc])

TYPES
    x		real
    acc		real

    return	real

DESCRIPTION
    Calculate the arc sine of x with an accuracy within eps.
    By default, eps is epsilon().

    The result is in the range [-pi/2, pi/2].

EXAMPLE
    > print asin(-1), asin(0), asin(2^-37)
    ~-1.57079632679489661923 0 ~.00000000000727595761

    > print asin(0.4), asin(0.4, 0.01), asin(sin(1), 0.001)
    ~.41151684606748801938 .411529541015625 .99999523162841796875

LIMITS
    -1 <= x <= 1
    acc > 0

LIBRARY
    NUMBER *qasin(NUMBER *x, *acc)

SEE ALSO
    acos, atan, atan2, cos, epsilon, sin, tan
