i = \cos \frac{\pi }
{2} + i\sin \frac{\pi }
{2} = e^{\frac{{i\pi }}
{2}} \Rightarrow i^\pi = e^{\frac{{i\pi ^2 }}
{2}} = \cos \frac{{\pi ^2 }}
{2} + i\sin \frac{{\pi ^2 }}
{2} \approx 0.220584 - 0.975368i