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

User Prashant G
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Hello here is a solution :
Find an identity for cos(4t) in terms of cos(t)-example-1
User Manuel Allenspach
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\cos4t=\cos2(2t)=2\cos^22t-1
User Borjovsky
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