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AIME 1984 Problem 13

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Find the value of 10cot⁡(cot⁡−13+cot⁡−17+cot⁡−113+cot⁡−121).10\cot(\cot^{-1}3+\cot^{-1}7+\cot^{-1}13+\cot^{-1}21).

Dataset text AIME 1983 to 2026. Quoted with source.

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