Use the definition of i to simplify ^{1}/_{i} Back

Pretty much the only property of i that we know is that i^{2}=-1. Thus, we try to multiply ^{1}/_{i} by ^{i}/_{i}:

^{1}/_{i} * ^{i}/_{i} = ^{i}/_{i2} = ^{i}/_{(-1)} = -i

so that ^{1}/_{i} = -i.