1.1.11 Vector Algebra

Problem: Find the cosine of the angle between the vectors \( \overrightarrow{A B} \) and \( \overrightarrow{A C} \). \[ A(6 ; 2 ;-3), \quad B(6 ; 3 ;-2), \quad C(7 ; 3 ;-3) \text {. } \]