i^(4*1/2)=(i^4)^(1/2)
( a^(m/n)=(a^m)^(1/n) a n
(
i^4)^1/2=1^ 1/2=(cos0+isin0)^1/2=+or-(cos0+isin0)=+or-1
(I^1/2)^4=(+or-(cos pi/4+isin pi/4)^4=cos pi+isin pi=-1
(i^4)^1/2not equal (i^ 1/2)^4
: 1 (0 1 )
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