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Evaluate cot(cot−1(7)+cot−1(13)+cot−1(21)+cot−1(31))\cot{(\cot^{-1}{(7)}+\cot^{-1}{(13)}+\cot^{-1}{(21)}+\cot^{-1}{(31)})}cot(cot−1(7)+cot−1(13)+cot−1(21)+cot−1(31))
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