Задача 54459 ...

5f885b8d0fdfb21243667ca9

15.10.2020 17:25:05

{(x-y=π/4
{tgx+ tg(-y)= 1/6)

5f3ea7e3faf909182968ddd9

15.10.2020 18:31:24

★

{y=x-(π/4)
{tgx-tg(x-(π/4))= 1/6, так как tg(-y)=-tgy

Формула ( см. приложение)

{y=x-(π/4)
6,sin(π/4)= cosx*cos(x-(π/4))