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10cot[cot−1(3)+cot−1(7)+cot−1(13)+cot−1(21)]= ?\large 10\cot \bigg [\cot^{-1}(3)+\cot^{-1}(7)+\cot^{-1}(13)+\cot^{-1}(21) \bigg] = \ ? 10cot[cot−1(3)+cot−1(7)+cot−1(13)+cot−1(21)]= ?
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