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Byju's Answer
Standard XII
Mathematics
Higher Order Derivatives
If a+bxey/x...
Question
If
(
a
+
b
x
)
e
y
/
x
=
x
, then prove that
x
3
d
2
y
d
x
2
=
(
x
d
y
d
x
−
y
)
2
Open in App
Solution
(
a
+
b
x
)
e
y
/
x
=
x
e
y
/
x
=
x
a
+
b
x
t
a
k
i
n
g
log
log
e
y
/
x
=
log
(
x
a
+
b
x
)
y
x
=
log
x
−
log
(
a
+
b
x
)
y
=
x
[
log
x
−
x
log
(
a
+
b
x
)
]
y
′
=
x
.
1
x
+
log
x
.1
−
x
(
1
a
+
b
x
)
×
b
−
log
(
a
+
b
x
)
→
(
i
)
y
′′
1
x
−
b
{
−
(
a
+
b
x
)
×
1
−
x
(
b
)
(
a
+
b
x
)
2
−
1
a
+
b
x
×
b
}
x
3
y
′′
=
(
x
d
y
d
x
)
2
−
2
x
y
d
y
d
x
+
y
2
=
(
x
d
y
d
x
−
y
)
2
Proved.
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