Maple on Android I have been using this app for couple of months and I can say that the best application I have ever seen.
Free version is worthless Requires internet connection to display adds which, by the way, are intrusive and ugly.
Needed to solve problem but there is no key function for V
The only improvement I could think of is that the editor would not be wiped each time I exit the app.
Full version. Bought. Best money ever spent.
bugfixes, most notably for history not being saved on many devices
Graphing Calculator for plotting functions, solving equations and more!