Gaokao Math Practice Question
设 $\vec{a}$、$\vec{b}$、$\vec{c}$ 是单位向量, 且 $\vec{a} \cdot \vec{b}=0$, 则 $(\vec{a}-\vec{c}) \cdot(\vec{b}-\vec{c})$ 的最小值为 （$\qquad$）
- A.-2
- B.$\sqrt{2}-2$
- C.-1
- D.$1-\sqrt{2}$
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