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Mathematics, 07.12.2019 18:31 kuuleilani

(1- cos10° + cos40° - cos50°)/(1 + cos10° - cos40°-cos50°) == tan 5º. cot 20°

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(1- cos10° + cos40° - cos50°)/(1 + cos10° - cos40°-cos50°) == tan 5º. cot 20°...
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