SOLUTION: how would you go about solving "i" to the 91st power getting either a positive or negative "i"

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Question 3340: how would you go about solving "i" to the 91st power getting either a positive or negative "i"
Answer by longjonsilver(2297) About Me  (Show Source):
You can put this solution on YOUR website!
i as in sqrt%28-1%29?
i repeats itself over 4 powers:

i = sqrt%28-1%29
i%5E2 = -1
i%5E3 = -i
i%5E4 = 1

then i%5E5 = i etc

so figure out where i%5E91 comes in this cycle and that is your answer