This app includes:
1) Equation Solver tool, which can solve equations of any format. For example:
4X*X - 3 = (X+2)(X-sin(90)) - 3X
2Y + Z = 4(X - 6.2)

2) Analytic Geometry tool, for example:
solve tangent line, solve intersection points ...

3) Polygon tool
calculate polygon area, angle, length ...


The app is localized to many languages.

Demo: http://ossly.com/math.html
In China: http://ossly.com/mathtudou.html

I wish you like it. Thank you.