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Byju's Answer
Standard XII
Mathematics
Theorems for Continuity
Let f be a ...
Question
Let
f
be a twice differentiable function such that
f
′′
(
x
)
=
−
f
(
x
)
and
f
′
(
x
)
=
g
(
x
)
.
.
If
h
′
(
x
)
=
[
f
(
x
)
]
2
+
[
g
(
x
)
]
2
,
h
(
1
)
=
6
and
h
(
0
)
=
4
then
h
(
4
)
is equal to?
A
16
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B
12
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C
13
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D
None of these
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Solution
The correct option is
B
12
Given
h
′
(
x
)
=
[
f
(
x
)
]
2
+
[
g
(
x
)
]
2
Differentiating both side w.r.t
x
, we get
h
′′
(
x
)
=
2
f
(
x
)
f
′
(
x
)
+
2
g
(
x
)
g
′
(
x
)
=
2
f
(
x
)
g
(
x
)
+
2
g
(
x
)
g
′′
(
x
)
[
∵
f
′
(
x
)
=
g
(
x
)
]
=
2
f
(
x
)
g
(
x
)
−
2
g
(
x
)
f
(
x
)
=
0
[
∵
f
′′
(
x
)
=
−
f
(
x
)
]
Thus
h
′
(
x
)
=
k
,
a constant for all
x
∈
R
.
Hence
h
(
x
)
=
a
x
+
b
,
so that form
h
(
0
)
=
4
,
we get
b
=
4
and from
h
(
1
)
=
6
we get
a
=
2
Therefore
h
(
4
)
=
12
Suggest Corrections
0
Similar questions
Q.
Let
f
be twice differentiable function such that
f
′′
(
x
)
=
−
f
(
x
)
and
f
′
(
x
)
=
g
(
x
)
. If
h
′
(
x
)
=
[
f
(
x
)
]
2
+
[
g
(
x
)
]
2
,
h
(
1
)
=
8
and
h
(
0
)
=
2
, then
h
(
2
)
=
Q.
Let
f
be the twice differentiable function such that
f
′′
(
x
)
=
−
f
(
x
)
and
f
′
(
x
)
=
g
(
x
)
. If
h
′
(
x
)
=
[
f
(
x
)
2
+
g
(
x
)
2
]
,
h
(
1
)
=
8
,
h
(
0
)
=
2
, then
h
(
2
)
equals to
Q.
Let f be a twice differentiable function such that
f
′′
(
x
)
=
−
f
(
x
)
and
f
′
(
x
)
=
g
(
x
)
. If
h
′
(
x
)
=
[
f
(
x
)
]
2
+
[
g
(
x
)
]
2
,
h
(
1
)
=
8
a
n
d
h
(
0
)
=
2
,
then
h
(
2
)
is equal to
Q.
Assertion(A): Let
f
(
x
)
be twice differentiable function such that
f
′′
(
x
)
=
−
f
(
x
)
and
f
′
(
x
)
=
g
(
x
)
. lf
h
(
x
)
=
[
f
(
x
)
]
2
+
[
g
(
x
)
]
2
and
h
(
1
)
=
8
, then
h
(
2
)
=
8
Reason (R): Derivative of a constant function is zero.
Q.
Let f(x),g(x) be two continuesely differentiable functions satisfying the relationships f'(x) = g(x) and f"(x) = - f(x). Let
h
(
x
)
=
[
f
(
x
)
]
2
+
[
g
(
x
)
]
2
. If h(0) = 5, then h(10) =
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