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T is a point on the tangent to a parabol...

T is a point on the tangent to a parabola `y^2= 4ax` at its point `P. TL and TN` are the perpendiculars on the focal radius SP and the directrix of the parabola respectively. Then (A) SL=2(TN) (B) 3(SL)=2(TN) (C) SL=(TN) (D) 2(SL)=3(TN)

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