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Mathematics, 19.08.2019 16:00 PlzNoToxicBan

Prove the identity: cos(3x) + cos(x) = 2cos(2x)cos(x)
i'm almost done with my homework, just got stuck on this one.

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Prove the identity: cos(3x) + cos(x) = 2cos(2x)cos(x)
i'm almost done with my homework, just...
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