PreCalculus - Trigonometry: Trig Identities (33 of 57) Proof Half Angle Formula: cos(x/2)
1:25
YouTubeMichel van Biezen
PreCalculus - Trigonometry: Trig Identities (33 of 57) Proof Half Angle Formula: cos(x/2)
Visit http://ilectureonline.com for more math and science lectures! In this video I will introduce the half-angle formula cos(x/2)=?
14.6K viewsAug 18, 2014
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