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EAMCET Engineering 2002 Solved Paper
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© examsnet.com
Question : 136
Total: 200
The equation
1
r
=
1
8
+
3
8
cos
θ
represents
a parabola
an ellipse
a hyperbola
a rectangular hyperbola
Validate
Solution:
We have,
1
r
=
1
8
+
3
8
cos
θ
⇒
8
=
r
+
3
r
cos
θ
⇒
r
=
8
−
3
x
⇒
r
2
=
(
8
−
3
x
)
2
⇒
x
2
+
y
2
=
64
+
9
x
2
−
48
x
⇒
8
x
2
−
y
2
−
48
x
+
64
=
0
Which represents a hyperbola.
© examsnet.com
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