29. Let the real number pair $(x, y)$ satisfy $(x-3)^{2}+(y-$ $3)^{2}=6$, find the maximum value of $\frac{y}{x}$.
(A) $3+2 \sqrt{2}$;
(B) $2+\sqrt{3}$;
(C) $3 \sqrt{3}$;
(D) 6 ;
(E) $6+2 \sqrt{3}$.
A
29. Let $\frac{y}{x}=k$, substitute into the given equation, and use the discriminant to find the maximum value of $k$, which is (A).