I derive two of the eight formulas of Product to Sum and Sum to Product and then work through 5 examples at 7:02 10:07 13:00 18:50 and 23:02
Please help me Close Caption this lesson.
Check out http://www.ProfRobBob.com, there you will find my lessons organized by class/subject and then by topics within each class. Find free review test, useful notes and more at http://www.mathplane.com
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