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Annifrid Lyngstad

Ann-Frid-Synni Lyngstad (born 1945) is best known as one of the four singers in the rock group ABBA. In 1992 she married Heinrich Ruzzo Reuss (1950-1999), of the princely Reuss family.

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Quadratic formula

... 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 roots of both sides ...