harriskori harriskori

22-03-2017
Mathematics

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find an identity for cos(4t) in terms of cos(t)

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LammettHash LammettHash

22-03-2017

[tex]\cos4t=\cos2(2t)=2\cos^22t-1[/tex]

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ghanami ghanami

22-03-2017

Hello here is a solution :

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