queenkennedy01
queenkennedy01 queenkennedy01
  • 25-05-2018
  • Mathematics
contestada

use demovires theorem to write the complex number in trigonometric form.
[tex] (\sqrt{3} + i)^{3} [/tex]

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LammettHash
LammettHash LammettHash
  • 25-05-2018
[tex]\sqrt3+i=2\left(\dfrac{\sqrt3}2+\dfrac12i\right)[/tex]

[tex]\begin{cases}\cos\dfrac\pi6=\dfrac{\sqrt3}2\\\\\sin\dfrac\pi6=\dfrac12\end{cases}[/tex]

[tex]\implies\sqrt3+i=2e^{i\pi/6}[/tex]

By DeMoivre's theorem,

[tex](\sqrt3+i)^3=(2e^{i\pi/6})^3=8e^{i\pi/2}=8\left(\cos\dfrac\pi2+i\sin\dfrac\pi2\right)=8i[/tex]
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