Encyclopedia > Afghanistan timeline 1981-1990

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Afghanistan timeline 1981-1990

Afghanistan timeline

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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Quadratic formula

... the parabola described by the quadratic equation touches the x-axis in a single point.) If the discriminant is positive, then there are two different solutions x, both ...