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
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