i^1 = i
i^2 = -1
i^3 = -i
i^4 = 1
i^5 = i
i^6 = -1
theres as pattern... every fourth power the cycle of i, -1, -i, 1 repeats. so divide 73 by four and take the remainder.
73/4 = 18 remainder 1. so you go to your little list and go to 1. so the answer is i.
i^2 = -1
i^3 = -i
i^4 = 1
i^5 = i
i^6 = -1
theres as pattern... every fourth power the cycle of i, -1, -i, 1 repeats. so divide 73 by four and take the remainder.
73/4 = 18 remainder 1. so you go to your little list and go to 1. so the answer is i.
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You can't