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The sum tan^(-1).(1)/(1+x+x^2)+tan^(-1)....

The sum `tan^(-1).(1)/(1+x+x^2)+tan^(-1).(1/(3+3x+x^2))+tan^(-1).(1/(7+5x+x^2))+tan^(-1)(1/(13+7x+x^2))` of first 100 terms of the series is

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