Test the Following Series for Convergence or Divergence $\sum _ { n = 1 } ^ { \infty } ( - 1 ) ^ { n } \cos \left( \frac { \pi } { n } \right)$

question 7

Short Answer

Test the following series for convergence or divergence: $\sum _ { n = 1 } ^ { \infty } ( - 1 ) ^ { n } \cos \left( \frac { \pi } { n } \right)$ .

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