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Mathematics, 15.01.2020 12:31 smady

(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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