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$\sum_{k=0}^{40} i^k = x + iy \Rightarrow x^{100} + x^{99}y + x^{242}y^2 + x^{97}y^3 = $

${\left( \frac{2i}{1+i} \right)}^2 = $

Express the given complex number in the form $a+ib$: $i^{-39}$

Express the given complex number in the form $a+ib$: $\left(\frac{1}{3}+3i\right)^{3}$

The simplified form of $i^{n} + i^{n+1} + i^{n+2} + i^{n+3}$ is

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