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经过圆x2+2x+y2=0的圆心C,且与直线x+y=0垂直的直线方程是( ) A...
经过圆x2+2x+y2=0的圆心C,且与直线x+y=0垂直的直线方程是( )
A.x+y+1=0
B.x+y-1=0
C.x-y+1=0
D.x-y-1=0
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,则sin2α等于( )
A.
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B.-
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D.-
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