В треугольнике ABC: угол С равен 90*, АС равна 12, sinA=5/13. Найдите сторону ВС
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Sin²A + cos²A = 1cos²A = 1 - sin²A = 1 - 25/169 = 144/169
cosA = 12/13
tgA = sinA/cosA = (5/13) : (12/13) = 5/12
tgA = BC/AC
5/12 = BC/12
BC = 5