The app also received an invitation from Google to be included in Google Play for Education and I take great pleasure in announcing that it got approved.
Today, I have great news for all the users of the app. The most requested feature - "The Graphs" has finally made its way into the app. Yes, you can now plot the graphs for all the 170 equations with all the combinations. This is optimised for tablets as well. Below are the screenshots of the app plotting the graphs.
You can download it at http://bit.ly/androidhsp
Oh, By the way, the app was also featured in NextBigWhat.