[iOS] Free 'Math Pro' $0 (Was $1.99) @ iTunes
"Math Pro" will take you through high-school Math and beyond. It is a powerful tool that is overflowing with the tutorials, examples, and solvers from the following applications: Algebra Pro, Geometry Pro, Probability Pro, Statistics Pro, PreCalculus Pro, and Calculus Pro.
Requires iOS 9.0 or later. Compatible with iPhone, iPad and iPod touch.