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Hans Peter Tschudi

Hans Peter Tschudi was president of Switzerland twice from:

January 1, 1965 to December 31, 1965
January 1, 1970 to December 31, 1970

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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 ...