Find the Sum of the Series $\sum _ { n = 0 } ^ { \infty } \frac { ( - 1 ) ^ { n } \pi ^ { 2 n + 1 } } { 3 ^ { 2 n } ( 2 n + 1 ) ! }$

question 69

Short Answer

Find the sum of the series $\sum _ { n = 0 } ^ { \infty } \frac { ( - 1 ) ^ { n } \pi ^ { 2 n + 1 } } { 3 ^ { 2 n } ( 2 n + 1 ) ! }$ .

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