As an engineering student. A good calculator is a must. Therefore, I’ve been searching in android market for any good calculator. From a few calculator apps that I’d tried, all of it seems a little basic but not this one. Handycalc is superb. Here’s why.
Write an equation
voila!! graph shown!!
It can also solve quadratic function!
There's also currency converter
If that is not enough.. There's even unit converter
List of features I listed here is far from completed. I suggest for any of you interested of know more tips and trick of HandyCalc go here. There you can much more info about the apps. Since its the developer website. 
. So far, I’ve only got good word for this apps. Try it yourself. I think it by far the best calculator apps in the android market. And it is free too. 
To download this apps, search for handycalc in market. Or you can always your barcode scanner and scan qr code below.
Scan here!!
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