Polar Form of Complex Number/Examples/3 cis -2 pi 3^-1/Mistake

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Source Work

1981: Murray R. Spiegel: Theory and Problems of Complex Variables (SI ed.)

Chapter $1$: Complex Numbers
Supplementary Problems: Polar Form of Complex Numbers: $84 \ \text {(f)}$


Mistake

Graph each of the following and express in rectangular form.
... $\text {(f)} \ \ 3 e^{-2 \pi i / 3}$
Ans. ... $\text {(f)} \ -3 \sqrt 3 / 2 - \paren {3 / 2} i$


Correction

The correct solution is:

$-\dfrac 3 2 - \dfrac {3 \sqrt 3} 2 i$


Sources