See how the fundamental theorem of algebra and the factor theorem work together.
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https://youtu.be/YxTWLuBtwJw?si=2EbsD9Cm_x9qsqtR In high school Trigonometry, I first learned this formula. It's quite amazing that this can be derived from the Law of Cosines. You can compute...
https://youtu.be/f0DEN7ooXRo?si=R4bbGw-1aXNOLH77