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[" The line "lx+my+n=0" is a tangent to ...

[" The line "lx+my+n=0" is a tangent to the "],[" curve "y=x-x^(2)+x^(3)," then "],[[" (A) "quad l>0,m>0," (B) "1<0,m<0],[" (C) "quad lm>0," (D) "lm<0]]

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