In the triangle ABC, if the angle a = 60 degrees and BC = 3, then the value range of AC + AB on both sides of the triangle ABC?

In the triangle ABC, if the angle a = 60 degrees and BC = 3, then the value range of AC + AB on both sides of the triangle ABC?

From cosine theorem
9=BC²=AC²+AB²-2AC•ABcos60º=AC²+AB²-AC•AB=(AC+AB)²-3AC•AB
≥ (AC+AB)²-3[(AC+AB)/2]²=(AC+AB)²/4,
∴AC+AB≤6,
And AC + AB > BC = 3, 3