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The eccentric...
Question
The eccentricity of the conic given by
x
=
t
2
+
t
+
1
,
y
=
t
2
−
t
+
1
is
e
,
where
t
is a parameter. Then
e
2
is equal to
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Solution
As
x
−
y
2
=
t
,
⇒
x
=
(
x
−
y
2
)
2
+
(
x
−
y
2
)
+
1
⇒
(
x
−
y
2
)
2
=
(
x
+
y
2
)
−
1
which represents a parabola.
Hence,
e
=
1
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