# It can't be all of them!

**Geometry**Level 3

\[ \large M= \large \sum_{k=1}^{n-1} \cos\left( \frac{2\pi}n k \right) \]

Above shows a trigonometric identity. What is the value of \(M\)?

\[ \large M= \large \sum_{k=1}^{n-1} \cos\left( \frac{2\pi}n k \right) \]

Above shows a trigonometric identity. What is the value of \(M\)?

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