Дано: tg(a) = 3/5
Мы знаем, что tg(a) = sin(a) / cos(a)
Подставляем tg(a) = 3/5:
3/5 = sin(a) / cos(a)
cos(a) = 5/3 sin(a)
(sin(a) + cos(a)) / (sin(a) - cos(a)) = (sin(a) + 5/3 sin(a)) / (sin(a) - 5/3 sin(a))= (8/3 sin(a)) / (-2/3 sin(a))= -4
Ответ: -4
Дано: tg(a) = 3/5
Мы знаем, что tg(a) = sin(a) / cos(a)
Подставляем tg(a) = 3/5:
3/5 = sin(a) / cos(a)
cos(a) = 5/3 sin(a)
(sin(a) + cos(a)) / (sin(a) - cos(a)) = (sin(a) + 5/3 sin(a)) / (sin(a) - 5/3 sin(a))
= (8/3 sin(a)) / (-2/3 sin(a))
= -4
Ответ: -4