A short trigonometric proof of the Steiner-Lehmus theorem - Mowaffaq Hajja We give a short trigonometric proof of the Steiner-Lehmus theorem. ✪ ✪ ✪ ✪ ✪ Hidden Content: **Hidden Content: Content of this hidden block can only be seen by members of (usergroups: V.I.P Downloader).** Theo LTTK Education