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ONLY PART C PLEASE

for part c i have tried to convert \(cos^4\Theta \) to \(2cosn\Theta \) which i wrote to be \((2cosn\Theta )^4\) then i can expand it in to the expression of z^n + 1/z^n and the same for sin

however i was told to use this method whist being unsure of why it works, please explain if you can. Thanks

 
 Oct 6, 2019

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