i've heard that the solution requires the use of the exponential taylor series:
The Attempt at a Solution
i know that the first step is to convert cos(1/z) into it's complex number form which is:
cos(1/z) = 0.5 (e^(i/z) + e^(-i/z))
I've tried manipulating 1/z and z^5 into the exp.taylor series but it gets messy (might be doing it wrong). any ideas would be great!
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