asinh

/*
 *  call-seq:
 *     Math.asinh(x)    => float
 *  
 *  Computes the inverse hyperbolic sine of <i>x</i>.
 */

static VALUE
math_asinh(obj, x)
    VALUE obj, x;
{
    Need_Float(x);
    return rb_float_new(asinh(RFLOAT(x)->value));
}