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RU-ALLRUSSIAN 1980 Problem 19

    ABCD is a tetrahedron. Angles ACB and ADB are 90 deg. Let k be the angle between the lines AC and BD. Show that cos⁡k<CD/AB\cos \mathrm{k}< \mathrm{CD} / \mathrm{AB} .

    Dataset text NuminaMath olympiads. Quoted with source.

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