Find the value of ∑k=18cos(2πk9)+isin(2πk9)

Find the value of $\sum_{k = 1}^{8} (\cos (\frac{2 πk}{9}) + isin (\frac{2 πk}{9}))$

Matching exercise

Match the items on the right to the items on the left.

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Step 5

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