Derive Cosine of a Sum Identity

YourMathGal (Julie Harland)
YourMathGal (Julie Harland)
helping math
Subject Math — Mathematical Functions
Grade Level Grades 6-12
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This video shows the formula for deriving the cosine of a sum of two angles. Videos by Julie Harland are organized by topic at yourmathgal.com<br />For more great math videos visit: www.youtube.com/user/videosbyjulieharland/videos . Aligned to Common Core State Standard: HSF-TF.9

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