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

User Charith Jayasanka
by
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1 Answer

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\cos4t=2\cos^22t-1=2(2\cos^2t-1)^2-1

\cos4t=8\cos^4t-8\cos^2t+1
User Firzok Nadeem
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