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[" 42.Find the value of "sum(r=1)^(10)su...

[" 42.Find the value of "sum_(r=1)^(10)sum_(s=1)^(10)tan^(-1)((r)/(s))],[[" (A) "100 pi," (B) "20 pi," (C) "25 pi," (D) "50]]

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