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Prove that the chord y-xsqrt2+4asqrt2=0 ...

Prove that the chord `y-xsqrt2+4asqrt2=0` is a normal chord of the parabola `y^2=4ax`. Also, find the point on the parabola when the given chord is normal to the parabola.

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The correct Answer is:
I.e(2a,`2sqrt2a`).
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