With a given point and line as focus and directrix, a
\( \mathrm{P}...
With a given point and line as focus and directrix, a
\( \mathrm{P}^{15: 2} \) series of ellipse are described, the locus of the
W extremities of their minor axis is:
(1) Ellipse
(2) Parabola
(3) Hyperbola
(4) None of these
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