2cos(x+3)>1 Help meeee

Question

2cos(x+3)>1
Help meeee

Answer 1

Cos(x + 3) > 1/2
см. рис.
- π/3 + 2πn < x + 3 < π/3 + 2πn
 - π/3 - 3 + 2πn < x  < π/3 - 3 + 2πn
x ∈ ( - π/3 - 3 + 2πn ;  π/3 - 3 + 2πn)