Don't post these things at the last minute next time, especially when there's an American holiday going on and the good math students are at home, celebrating with their families, okay?
This looks very similar to the law of cosines--check that out.
Ubi caritas est vera, Deus ibi est.
"The mark of your ignorance is the depth of your belief in injustice and tragedy. What the caterpillar calls the end of the world, the Master calls the butterfly." ~ Richard Bach
When she transformed into a butterfly, the caterpillars spoke not of her beauty, but of her weirdness. They wanted her to change back into what she always had been. But she had wings. — Dean Jackson
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