Question

Нужна ваша помощь .......

Answer 1

18
tg3x=√3/3
3x=π/6+πk
x=π/9+πk/3,k∈z
19
sin2x=1/2
2x=π/6+2πk U x=5π/6+2πk
x=π/12+πk U x=5π/12+πk,k∈z