whitngrace whitngrace

25-10-2016
Mathematics

contestada

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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davidevan96 davidevan96

25-10-2016

I'm having the same problem

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I need some help!! (combining/simplifying like terms)