已知圆O的方程为x2+y2=1,过点P(-2,0)作圆的两条切线,切点分别是A,B,则直线AB的方程是( )。

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问题 已知圆O的方程为x2+y2=1,过点P(-2,0)作圆的两条切线,切点分别是A,B,则直线AB的方程是( )。
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答案 B
解析

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