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Show that the focal chord of parabola y^...

Show that the focal chord of parabola `y^2=4ax` makes an angle `alpha` with the x axis is of length `4a cosec^2a`.

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Show that the focal chord, of parabola y^2 = 4ax , that makes an angle alpha with the x-axis is of length 4a cosec^2 alpha .

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