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

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

Test the Following Series for Convergence or Divergence ∑n=1∞(−1)ncos⁡(πn)\sum _ { n = 1 } ^ { \infty } ( - 1 ) ^ { n } \cos \left( \frac { \pi } { n } \right)∑n=1∞​(−1)ncos(nπ​)

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