July 2022 0 8 Report
В кубе ABCDA1B1C1D1 найдите косинус угла между прямыми АВ и СА1 ( из точки А выходят рёбра АВ,AD,AA1 ; из точки В выходят рёбра ВС,ВА,ВВ1; СА1 - диагональ куба).
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