In the works of J. R. R. Tolkien, Calacirya is the pass in the Pelori north of Taniquetil where Tirion was set on Tuna. After the hiding of Valinor this was the lone gap through the mountains of Aman.
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... called the roots of the equation. The formula reads
<math>
x=\frac{-b \pm \sqrt {b^2-4ac}}{2a}
</math>
The term b2 – 4ac is called the discriminant ...