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NDA · Maths · Conics
NDA Conics — Formulas 1
Question
1
of 18
1.
Which equation is the focus–directrix definition of a conic (
P
F
PF
P
F
= distance to focus,
P
M
PM
P
M
= distance to directrix,
e
e
e
= eccentricity)?
A
P
F
P
M
=
e
\dfrac{PF}{PM} = e
P
M
P
F
=
e
B
P
M
P
F
=
e
\dfrac{PM}{PF} = e
P
F
P
M
=
e
C
P
F
⋅
P
M
=
e
PF \cdot PM = e
P
F
⋅
P
M
=
e
D
P
F
−
P
M
=
e
PF - PM = e
P
F
−
P
M
=
e
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