MathematicsMedium66×since 2002Q4120The value of cot(∑n=119cot−1(1+∑p=1n2p))\cot \left( {\sum\limits_{n = 1}^{19} {{{\cot }^{ - 1}}} \left( {1 + \sum\limits_{p = 1}^n {2p} } \right)} \right)cot(n=1∑19cot−1(1+p=1∑n2p)) is :A2223{{22} \over {23}}2322B2322{{23} \over {22}}2223C2119{{21} \over {19}}1921D1921{{19} \over {21}}2119Check answerSkip