[" Fe "sum(5=1)^(oo)Tan^(-1)((1)/(2r^(2)...

[" Fe "sum_(5=1)^(oo)Tan^(-1)((1)/(2r^(2)))=3(1)/(sqrt(3))],[[" 1) "0," 2) "(pi)/(4)," 3) "(pi)/(3)]]

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