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Задача 5(угол между прямой и плоскостью)
Через вершину А прямоугольника АВСD проведена наклонная АМ к плоскости прямоугольника, составляющая 50 градусов со сторонами АD и АВ. Найдите угол между этой наклонной и плоскостью прямоугольника.