Prove that tangents to the focal cord of parabola are perpendicular using the reflection property of parabola ( A ray of light striking parallel to the focal plane goes through the focus, and a ray of light going through the focus goes parallel)(adsbygoogle = window.adsbygoogle || []).push({});

I don't know whether this is solvable with just this much detail, just something I've been thinking about, looks doable but I've not been able to get anywhere. The geometry is quite tangled.

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# B Prove that tangents to the focal cord of parabola...

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