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Eosin

Eosin is an orange-pink dye derived from coal tar[?]. It can be used to stain cytoplasm, collagen and muscle fibres[?] for examination under the microscope.

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Quadratic formula

... we get <math>x=\frac{-b}{2a}\pm\frac{\sqrt{b^2-4ac}}{2a}=\frac{-b\pm\sqrt{b^2-4ac}}{2a}.</math> Generalizations The formula and its proof remain ...