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 :
\.gif\")