_precalculus-trigonometry-trig-identities-31-of-57-proof-cos2x1cos2x-2-preview-1.jpg "PreCalculus - Trigonometry: Trig Identities (31 of 57) Proof cos(x)=(1+cos2x) 2 from cos 2 ableiten Video Screenshot Preview 1")
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Michel van Biezen
Michel van Biezen
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