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Show that the length of the chord of con...

Show that the length of the chord of contact of the tangents drawn from `(x_1,y_1)` to the parabola `y^2=4ax` is `1/asqrt[(y_1^2-4ax_1)(y_1^2+4a^2)]`

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The correct Answer is:
`1/|a|sqrt((y_1^2-4ax_1)(y_1^2+4a^2))`.
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