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38:01
YouTube
Leslie Glen
Trigonometry: Addition and Subtraction Formulas
There are many identities in trigonometry, but a few are used so frequently that they are worth knowing well. The sine, cosine, and tangent of the sum or difference of two angles are some of those identities. In this video, I'll tell you what those formulas are, and I'll prove one of them so that you can see how that is done, and so that you'll ...
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Aug 7, 2022
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