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2:36
YouTube
Michel van Biezen
PreCalculus - Trigonometry: Trig Identities (31 of 57) Proof cos^2(x)=(1+cos2x)/2
Visit http://ilectureonline.com for more math and science lectures! In this video I will prove cos^2(x)=(1+cos2x)/2.
40.8K views
Aug 17, 2014
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