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What's the polar equation of an ellipse given the eccentricity=1/2 directrix=y=? also how do i know if it is sin or cosine?
7 years ago

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Answered by Steve
recall that the ellipse with eccentricity e and directrix x=d is

r = ed/(1 + e*cosθ)

If you have a y=d directrix then it uses sinθ
7 years ago
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What's the polar equation of an ellipse given the eccentricity=1/2 directrix=y=? also how do i know if it is sin or cosine?

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