You are downloading the Math Formulas XAP file v188.8.131.52 for Windows Phone. Math Formulas is a free and useful Education app: V2.0.0-------Added matrix formulas, UI changesV1.0.0-------Algebra, Geometry, Trigonometry, Calculus, Statistics Formulas. ... You can now download the offline XAP file to install & try it.
Download Locations for Math Formulas 184.108.40.206 XAP file
Note: To install it manually from an SD card, you should choose one of the server location above to get the offline Math Formulas XAP file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.