Encyclopedia > Afghanistan timeline 1981-1990

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Afghanistan timeline 1981-1990

In 1985, Afghanistan produced 31 percent of the world's opium, according to the U.N. Office for Drug Control and Crime Prevention.

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