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[" 56.The value of "cot[sum(n=1)^(23){co...

[" 56.The value of "cot[sum_(n=1)^(23){cot^(-1)(1+sum_(k=1)^(n)2k)}]," is "],[qquad [1](23)/(25),2](25)/(23),3](23)/(24),4](24)/(23)]]

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