The eccentricity of a conic is .
Vertices of the conic is at and
.
Since the eccentricity is , the conic is hyperbola.
Center is the mid point of the two vertices.
\Therefore, the center of the ellipse is at .
Therefore the directrix will be in the right side of the pole at .
The polar equation of the conic with the directrix is .
Find the value of :
The vertex has polar coordinates
.
and
Susbtitute in
.
.
Susbtitute in
.
.
The standard form of polar equation is : .
Substitute ,
and
.
Substitute ,
in
.
.
Therefore, the polar equation of the conic is and directrix is
.
Graph:
\(1) Draw the coordinate plane.
\(2) Graph the polar equation .
Graph :
\
The polar equation is .
Graph :
\