A 48 Probably.Making a Trip Attack
Make an unarmed melee touch attack against your target. This provokes an attack of opportunity from your target as normal for unarmed attacks.Unless the creature has a natural weapon which is specifically a tripping weapon, it uses an unarmed attack rather than its natural weapons when making a trip attempt. Only a natural weapon attack (such as a Wolf's bite) other than an unarmed strike will normally avoid provoking an AoO when making a trip attempt.A creature making a melee attack with a natural weapon is considered armed and does not provoke attacks of opportunity.
If a creature has Improved Unarmed Strike, the normal behavior is to not provoke AoOs.Once you have this feat, unarmed attacks (including trip attacks) will not provoke AoOs.Benefit: You are considered to be armed even when unarmed —that is, you do not provoke attacks or opportunity from armed opponents when you attack them while unarmed.