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10-10-2017
Mathematics

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Find an identity for cos(4t) in terms of cos(t)cos⁡(t).

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LammettHash LammettHash

10-10-2017

[tex]\cos4t=2\cos^22t-1=2(2\cos^2t-1)^2-1[/tex]
[tex]\cos4t=8\cos^4t-8\cos^2t+1[/tex]

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