Gaokao Math Practice Question
在 $\triangle A B C$ 中, $A C=3, B C=4, \angle C=90^{\circ} . P$ 为 $\triangle A B C$ 所在平面内的动点, 且 $P C=1$, 则 $\overrightarrow{P A} \cdot \overrightarrow{P B}$ 的取值范围是 ($\quad$)
- A.$[-5,3]$
- B.$[-3,5]$
- C.$[-6,4]$
- D.$[-4,6]$
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