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Author Topic: Sum and Difference Angle Formulas Mark Karadimos Posted: 03-Feb-18 14:53   Edit   Mail   Profile   We have two new materials. Quiz: Sum and Difference Angle Formulas http://www.mathguide.com/cgi-bin/quizmasters3/SDA.cgi Video: Sum and Difference Angle Formulas Proof https://www.youtube.com/watch?v=qxUMZ80HX_o   Mark Karadimos Posted: 09-Feb-18 13:46 Delete    Edit   Mail   Profile   We have new lessons, called... Sum and Difference Angle Formulas (Sine, Cosine) http://www.mathguide.com/lessons2/SDA.html Sum and Difference Angle Formulas (Tangent) http://www.mathguide.com/lessons2/SDAT.html

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