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1. The problem statement, all variables and given/known data

write a polar equation of a conic with the focus at the origin and the given data.

i know it's an ellipse with eccentricity 0.8 and vertex (1, pie/2)

3. The attempt at a solution

my question is: how do I find the directrix using the vertex and the focus point?

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# Homework Help: Conic sections in polar coordinates

**Physics Forums | Science Articles, Homework Help, Discussion**