What Are the Three Roots Of $27\left(\cos \frac{9 \pi}{5}+i \sin \frac{9 \pi}{5}\right) ?$

question 48

Essay

What are the three roots of $27\left(\cos \frac{9 \pi}{5}+i \sin \frac{9 \pi}{5}\right) ?$
Express the answers in trigonometric form.

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