No, the prayer is not valid.
will my prayer be valid if i read the following short version of tashahhud in the final sitting- At-Tahiyyaatu lillaah; salaamun ʻalayka ayyuha an-nabiyy; salaamun ʻala ibaadillaah as-saaliheen; ashhadu alla ilaaha illa Allaah, wa anna Muhammadan rasooluh