
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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