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1. 根据图中条件分别求$\tan A$的值.
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2. 如图，在$Rt\triangle ABC$中，$\angle ACB = 90^{\circ}$，$CD \perp AB$，垂足为$D$.
(1) $\tan B = \frac{(\ \ \ \ \ )}{(\ \ \ \ \ )} = \frac{(\ \ \ \ \ )}{(\ \ \ \ \ )} = \frac{(\ \ \ \ \ )}{(\ \ \ \ \ )}$.
(2) 已知$BD = 6$，$CD = 12$. 求$\tan A$的值.
(1) $\tan B = \frac{(\ \ \ \ \ )}{(\ \ \ \ \ )} = \frac{(\ \ \ \ \ )}{(\ \ \ \ \ )} = \frac{(\ \ \ \ \ )}{(\ \ \ \ \ )}$.
(2) 已知$BD = 6$，$CD = 12$. 求$\tan A$的值.
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3. 在$Rt\triangle ABC$中，$\angle C = 90^{\circ}$，$AC = 3$，$AB = 6$. 求$\tan A$和$\tan B$的值.
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