共50条信息
已知向量\( \overset{→}{BA}=( \dfrac{1}{2}, \dfrac{ \sqrt{3}}{2}) \),\( \overset{→}{BC}=\left( \dfrac{ \sqrt{3}}{2}, \dfrac{1}{2}\right) \) 则\(\angle ABC=\)( )
已知向量\(\overset{\to }{{BA}}\,\)\(=(\)\(\dfrac{1}{2}\),\(\dfrac{\sqrt{3}}{2}\)\()\),\(\overset{\to }{{BC}}\,\)\(=(\)\(\dfrac{\sqrt{3}}{2}\),\(\dfrac{1}{2}\)\()\),则\(∠ABC=\)( )
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