В треугольнике АВС АС=ВС, АВ=14, АН — высота, ВН=7. Найдите косинус угла ВАС.
Подсказка:Так как АС=ВС, то треугольник АВС равнобедренный. Следует, что угол А равен углу В.
Косинус — это отношение прилежащего катета (НВ) к гипотенузе (АВ).
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