I recently launched an app by the name of Conform that solves common formulas in Geometry, Algebra, and Trigonometry. It also can convert over 100 units and perform fraction arithmetic as well as an interest calculator. It's great for travelers because of its ability to convert time zones. It is a very useful tool in simplifying extensive, and difficult formulas and I hope to hear from you guys what you think of it.
Link: Conform | Windows Phone Apps+Games Store (United States)
Link: Conform | Windows Phone Apps+Games Store (United States)