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Lyra

Lyra (the lyre) is a relatively small northern constellation. It was one of Ptolemy's 48 constellations, and also counts among the modern 88 constellations. Its brightest star is Vega which is a vertex of the so-called "Summer Triangle".



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Quadratic formula

... {b^2-4ac}}{2a} </math> The term b2 – 4ac is called the discriminant of the quadratic equation, because it discriminates between three qualitatively different ...

 
 
 
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