Решите уравнения а) 2 cos х/3= -1 б)tg (x-π/3)-1=0

Question

Решите уравнения а) 2 cos х/3= -1 б)tg (x-π/3)-1=0

Answer 1

1)cosx/3=-1/2
x/3=+-2π/3+2πn
x=+-2π+6πn
2)tg(x-π/3)=1
x-π/3=π/4+πn
x=7π/12+πn