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[" 21.A line bisecting the ordinate "PN"...

[" 21.A line bisecting the ordinate "PN" of a point "],[P(at^(2),2at),t>0" ,on the parabola "y^(2)=4ax" is "],[" drawn parallel to the axis to meet the curve at "],[" Q.If "NQ" meets the tangents at the vertex at "],[" the point T.Then the coordinates of T are."],[(0,(4)/(3)at)quad " 2) "(0,2at)3)((1)/(4)at^(2),at)" 4) "(0,at)]

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