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Find the equation of the tangent to t...

Find the equation of the tangent to the parabola `y^2=4a x` at the point `(a t^2,\ 2a t)` .

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The correct Answer is:
A, B, C, D
AB is focal chord, tangents at which to the parabola intersect on dirextrix. AD is normal chord of the parabola.
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