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Easy College Algebra Made Easy Linear Algebra Made Easy Statistics and Probability Made Easy Trigonometry Made Easy PreCalculus Made Easy Complex Analysis Made Easy Chemistry Made Easy Step by Step Equation Solver Physics Made Easy Chemistry Made Easy Geometry Made Easy Algebra Made Easy Conics Made Easy Number Theory Made Easy Finite Math Made Easy Business Calculus Made Easy Business Finance Made Easy Thermodynanmics Made Easy SAT Made Easy Business Stats Made Easy Actuarial Math Made Easy Step by Step Unit Converter Numerical Analysis Made Easy Operations Research Made Easy Calculus with Physics Apps Portfolio&Investment Made Easy Discrete Math Made Easy Economics Made Easy 7) Select  7. app:   Calculus Made Easy Differential Equations Made Easy Matrix Made Easy College Algebra Made Easy Linear Algebra Made Easy Statistics and Probability Made Easy Trigonometry Made Easy PreCalculus Made Easy Complex Analysis Made Easy Chemistry Made Easy Step by Step Equation Solver Physics Made 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Immediately after the Paypal checkout, an email will be sent to you containing your activation keys and installation instructions. You may read the instructions here as well: http://www.ti89.com/thankyou.htm Note: The activation keys will also work with non-English apps (Spanish or German).