Evaluate i\sqrt{i}i (principal square root).
1+i2\frac{1+i}{\sqrt{2}}21+i
1−i2\frac{1-i}{\sqrt{2}}21−i
−1+i2\frac{-1+i}{\sqrt{2}}2−1+i
−1−i2\frac{-1-i}{\sqrt{2}}2−1−i