Mathematics, 10.10.2019 16:00 emmanuellugo40

Find an identity for cos(4t) in terms of cos(t).
i have used 2cos^2(2t)-1 but i need to rewrite that in terms of cos(2t).

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Find an identity for cos(4t) in terms of cos(t).
i have used 2cos^2(2t)-1 but i need to rewri...