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Nghi Nguyen
About Nghi Retired math tutor. Co-author of 4 high school math books: - Solving math quadratic equations and inequalities (Dorrance Publishing) - Trigonometry: Solving trig equations and inequalities (Trafford Publishing) - Linear equations, inequalities, and functions (Trafford Publishing) - New methods for solving quadratic equation and inequalities (Amazon e-book 2010).
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