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[" Let "y^(2)=4" ax be a parabola and "x...

[" Let "y^(2)=4" ax be a parabola and "x^(2)+y^(2)+2bx=0" be a circle.If parabola and circle touch each other extemally "],[" then: "],[[" (A) "a>0,b>0," (B) "a>0,b<0," (C) "a<0,b>0," (D) "a<0,b<0]]

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