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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 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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