[sum(r=1)^(oo)Tan^(-1)((1)/(2r^(2)))=],[...

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

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