Two tangents to a parabola will be perpendicular (i.e. the product of their slopes will be -1) if they are drawn through an external point ( x₀ ; y₀ ) on the directrix ( -1 / 4 a ). |
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Two tangents to a parabola will be perpendicular (i.e. the product of their slopes will be -1) if they are drawn through an external point ( x₀ ; y₀ ) on the directrix ( -1 / 4 a ). |
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