Cos 5x×tgx=0 решить уравнение
Cos 5x•tg x = 0 cos 5x = 0 5x = π/2 + πn, n є Z x = π/10 + πn/5, n є Z tg x = 0 x = πn, n є Z Ответ: x = π/10 + πn/5, x = πn, n є Z