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TN XII Math
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Q)
The differential equation obtained by eliminating
a
and
b
from
y
=
a
e
3
x
+
b
e
−
3
x
is
(
1
)
d
2
y
d
x
2
+
a
y
=
0
(
2
)
d
2
y
d
x
2
−
9
y
=
0
(
3
)
d
2
y
d
x
2
−
9
d
y
d
x
=
0
(
4
)
d
2
y
d
x
2
+
9
x
=
0
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