# If a conic section is written as a polar equation, and the denominator involves sin theta, what conclusion can be drawn about the directrix?

If a conic section is written as a polar equation, and the denominator involves , what conclusion can be drawn about the directrix?
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hosentak
IF a conic has a focus at the origin, directrix and with a positive real number e as the eccentricity, then the polar equation of the conic is given by So when there is $\mathrm{sin}\theta$ in the denominator, the directrix is the form i.e. it is parallel to x-axis.