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 davidevan96
  • 25-10-2016
I'm having the same problem

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