22. (10 points) Elective 4-1: Geometric Proof\\
As shown in the figure, AB is tangent to circle O at point B. Line AD intersects circle O at points D and E. $\mathrm { BC } \perp \mathrm { DE }$, with C as the foot of the perpendicular.\\
(I) Prove that $\angle \mathrm { CBD } = \angle \mathrm { DBA }$;\\
(II) If $\mathrm { AD } = 3 \mathrm { DC } , ~ \mathrm { BC }