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Point Form of Normal: Ellipse

y = x 21 / 2-...

Question

y=x2^1/2- 4a2^1/2is a normal chord to y²= 4ax. Then it’s length is??

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Solution

Please give proper equation of normal chord. I am not able to understand the Equation.
I can solve it if you given the Equatio of chord Properly.

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