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Equation of a parabola from focus & directrix
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Khan Academy
SOLVED:In Exercises 5 through 14, the equation is that of a conic having a focus at the pole. In each Exercise, (a) find the eccentricity; (b) identify the conic; (c) write an equation of the directrix which corresponds to the focus at the pole; (d) draw a sketch of the curve. r=(5)/(2 sinθ)
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