[" 70.The sum of the series cot" "2+cot^...

[" 70.The sum of the series cot" "2+cot^(-1)8+cot^(-1)18],[+cot^(-1)32+..." is "],[[" (a) "(pi)/(2)," (b) "(pi)/(4)," (c) "(pi)/(6)," (d) None of these "]]

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