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2015

Centuries: 20th century - 21st century - 22nd century

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Years: 2010 2011 2012 2013 2014 - 2015 - 2016 2017 2018 2019 2020

Events

March 20 - Total solar eclipse
September 13 - Partial solar eclipse

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Quadratic formula

... is real. (Geometrically, this means that the parabola described by the quadratic equation touches the x-axis in a single point.) If the discriminant is positive, then ...