November 2021 0 18 Report
Если в прямоугольном параллелепипеде ABCDA1B1C1D1 диагональ АС1 образует углы а, в, у с его рёбрами АВ, АD, AA1 соответственно , то cos²a+cos²b+cos²y=1. Доведите. Решите , пожалуйста с рисунком. Спасибо
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