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[" 53.A tangent to the parabola "y^(2)+4...

[" 53.A tangent to the parabola "y^(2)+4bx=0" meets "y^(2)=4ax" at "P" and "Q" ,then the locus of midpoint of the "],[" chord "PQ" is."],[[" A) "y^(2)(a+2b)=4a^(2)x," B) "y^(2)(2a+b)=4a^(2)x],[" C) "y^(2)(2a+b)=2a^(2)x," D) "y^(2)(a+2b)=2a^(2)x]]

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