De Moivre's Theorem
Hi there.
My question says to show that "Cos4θ = 8Cos4θ -8Cos2θ +1"
So I tried to do this using De Movire's theorem but I cant seem to get it. I'll post my working below if anyone wants to look where I may have gone wrong, but I cant see it myself..
My question says to show that "Cos4θ = 8Cos4θ -8Cos2θ +1"
So I tried to do this using De Movire's theorem but I cant seem to get it. I'll post my working below if anyone wants to look where I may have gone wrong, but I cant see it myself..
Original post by Eremor
Hi there.
My question says to show that "Cos4θ = 8Cos4θ -8Cos2θ +1"
So I tried to do this using De Movire's theorem but I cant seem to get it. I'll post my working below if anyone wants to look where I may have gone wrong, but I cant see it myself..
My question says to show that "Cos4θ = 8Cos4θ -8Cos2θ +1"
So I tried to do this using De Movire's theorem but I cant seem to get it. I'll post my working below if anyone wants to look where I may have gone wrong, but I cant see it myself..
This requires a different approach which is very standard ...
look at two similar examples one showing sin5θ and one showng cos6θ which might help you do your question
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