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Grade Level Grades 6-12
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Youtube videos by Julie Harland are organized at http://YourMathGal.com. We verify a Trig identity by using the basic identities and the identity for the cosine of a sum or difference. We prove that (cos(x+y))/(cos(x — y) = (coty — - tanx&#183;tany using a trig proof. Aligned to Common Core State Standard: HSF-TF.9 <br />For more great math videos visit: www.youtube.com/user/videosbyjulieharland/videos

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