JEE MAIN - Mathematics Hindi (2019 - 10th January Evening Slot - No. 17)
$$\cot \left( {\sum\limits_{n = 1}^{19} {{{\cot }^{ - 1}}} \left( {1 + \sum\limits_{p = 1}^n {2p} } \right)} \right)$$ का मान है:
$${{22} \over {23}}$$
$${{23} \over {22}}$$
$${{21} \over {19}}$$
$${{19} \over {21}}$$
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