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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
https://youtu.be/JZsLnxPQ680 This video shows 4 examples. It provides a step-by-step commentary on how to rearrange what appear to be complicated equations.
https://youtu.be/JQu-kJwtI1U These are more great beginning word problems. They require creating a system of equations.
https://youtu.be/6u3H5FUTqnw?si=Q_ZQ_mN87KdW-6U4 These are good starter word problems that ensure that we have our terminology correct. Things like sum, difference, more than, less than,...
https://youtu.be/12smfMEjqys?si=LDptHpHl7HK_1NVS