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# help

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Use DeMoivre’s Theorem to find the following:

5(cis 7π/4)^4

May 14, 2020

#1
+110833
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I have no idea what DeMoive's theorem is but this is just

$$5*e^{7\pi i}\\=5e^{\pi i } \\= 5(cos\pi+isin\pi)\\=5(-1+0)\\=-5$$

May 14, 2020