$i^3=1$, this must be false but

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Ok this is quite dumb and absurd but it goes like this:

$i^3 = (i^4)^{3/4}= 1^{3/4} = 1$

I am not very sure what the mistake is, maybe if this was true we contradict $(i^4)^{3/4} \neq (i^{3/4})^3$