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Find the equation of the common tangents...

Find the equation of the common tangents to `y^2 = 8ax` and `x^2 + y^2 = 2a^2`

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  12. A square has one vertex at the vertex of the parabola y^2=4a x and the...

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  13. P ,Q , and R are the feet of the normals drawn to a parabola (y-3)^2=8...

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