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过直线y=x上的一点作圆(x-5)2+(y-1)2=2的两条切线l1,l2,当直...
过直线y=x上的一点作圆(x-5)2+(y-1)2=2的两条切线l1,l2,当直线l1,l2关于y=x对称时,它们之间的夹角为( )
A.30°
B.45°
C.60°
D.90°
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