Rainis[?] (real name: Janis Pliek*ans, 1865-1929), the most distinguished Latvian writer of all time who is the author of a number of poetry collections. Rainis is also acknowledged as the "Man of the 20th Century of Latvia".
... \pm \sqrt {b^2-4ac}}{2a}
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The term b2 – 4ac is called the discriminant of the quadratic equation, because it discriminates between three ...