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Tres Fronteras

Tres Fronteras is an area of the Amazon Rainforest where the three states of Brasil, Peru, and Colombia meet. The three cities, Tabatinga[?], Leticia, and Santa Rosa[?] are located in this beautiful part of the world.

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Quadratic formula

... fraction; the common denominator is 4a2. We get <math>\left(x+\frac{b}{2a}\right)^2=\frac{-4ac+b^2}{4a^2}=\frac{b^2-4ac}{4a^2}.</math> Taking square ...