Which expression is equivalent to i233 ?

We know that,

$i2 = -1i3 = i2 x i = -1 x i = -ii4 = i2 x i2 = -1 x -1 = 1\mathrm{Hence}, i233 =i4 x 58 + 1 = i232 x i1 = 1 x i = i$