Show That If $\sum _ { n = 1 } ^ { \infty } a _ { n }$

question 335

Essay

Show that if $\sum _ { n = 1 } ^ { \infty } a _ { n }$ converges, then $\sum _ { n = 1 } ^ { \infty } \cos \left( a _ { n } \right)$ diverges.

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