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www.mathway.com

and i be back

is z given ?

z is a variable

I expanded the top, not even close to getting 0.1765 z ^ -1

you can use De Moivre's theorem
\[z ^{-n} = r ^{-n}[\cos(n \theta)-jsin(n \theta)]\]

that gives me 1

can you use MATLAB ?

nvm i found the answer! just needed to fully expand it and it works itself out
thx for help!!!