repair asin and acos on complex numbers (though why the old algorithm was wrong is frankly beyond me)
repair asin and acos on complex numbers (though why the old algorithm was wrong is frankly beyond me)

svn: r11196

mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket