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Standard XII
Mathematics
Higher Order Derivatives
Question
The value of
d
2
y
d
x
2
at the point where
f
(
t
)
=
g
(
t
)
is
0
1
2
1
2
A
0
B
1
2
C
2
D
1
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Solution
Verified by Toppr
x
=
f
(
t
)
=
a
ln
(
b
t
)
=
a
t
ln
b
---------- (1)
y
=
g
(
t
)
=
b
−
ln
(
a
t
)
=
(
b
ln
a
)
−
t
=
(
a
ln
b
)
−
t
=
a
−
t
ln
b
∴
y
=
g
(
t
)
=
a
ln
(
b
−
t
)
=
f
(
−
t
)
----------- (2)
From equations (1) and (2),
x
y
=
1
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