JEE Math Practice Question
The value of $$\cot \left( {\sum\limits_{n = 1}^{19} {{{\cot }^{ - 1}}} \left( {1 + \sum\limits_{p = 1}^n {2p} } \right)} \right)$$ is :
- A.$${{22} \over {23}}$$
- B.$${{23} \over {22}}$$
- C.$${{21} \over {19}}$$
- D.$${{19} \over {21}}$$
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