& -2 & 1 \\
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- - 91 + 1 = 819
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- + \frac{2\pi}{5} + \frac{4\pi}{5} + \frac{6\pi}{5} + \frac{8\pi}{5} = \frac{(0 + 2 + 4 + 6 + 8)\pi}{5} = \frac{20\pi}{5} = 4\pi
- = \mathbf{i}(2 + 6) - \mathbf{j}(1 - 3) + \mathbf{k}(-2 - 2) = \langle 8, 2, -4 \rangle
- $ z = \pm 1 $, both real, so imaginary part is 0.
- $ k=0 $: $ e^{i\pi/4} = \frac{\sqrt{2}}{2} + i\frac{\sqrt{2}}{2} $
