Does uttering "you are divorced, divorced, divorced" as a single phrase constitute a triple divorce, and can the wife be taken back after nine months have passed since this utterance, given that it was not officially documented, and knowing that this was the first divorce?

It appears that you uttered the divorce (talaq) willingly and consciously, so your divorce is effective, even if it occurred in a state of anger. Your saying to your wife, "Divorced, divorced, divorced," could mean three divorces or one, depending on your intention. If you did not intend to issue three divorces, then one divorce has occurred, and you may take your wife back (raj'ah) before her waiting period ('iddah) ends with the delivery of her child. However, if you intended to issue three divorces, then three divorces have occurred, and your wife has become irrevocably divorced from you (baynunah kubra). She is not lawful for you unless she marries another husband, he consummates the marriage with her, and then he divorces her or dies, and her waiting period from him ends. Ibn Taymiyyah and those who agreed with him hold the view that it is considered a single divorce.