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The value of cot sum(n=1)^(19)(cot^(-1)(...

The value of `cot sum_(n=1)^(19)(cot^(-1)(1+sum_(p=1)^(n)2p))` is equal to (a) `(21)/(19)` (b) `(19)/(21)` (c) `-(19)/(21)` (d) `-(21)/(19)`

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The value of cotsum_(n=1)^(19)cot^(-1)(1+sum_(p=1)^(n)2p) is equal to (a) (21)/(19) (b) (19)/(21) (c) -(19)/(21) (d) -(21)/(19)

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