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Byju's Answer
Standard XII
Mathematics
Continuity of a Function
The function ...
Question
The function defined by
f
(
x
)
=
⎧
⎨
⎩
x
.
sin
1
x
f
o
r
x
≠
0
0
f
o
r
x
=
0
at
x
=
0
is
A
continuous
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B
richt continuous
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C
left continuous
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D
can not be determined
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Solution
The correct option is
A
continuous
We have,
∣
∣
∣
sin
1
x
∣
∣
∣
≤
1
∀
x
∈
R
or,
∣
∣
∣
x
sin
1
x
∣
∣
∣
≤
|
x
|
∀
x
∈
R
⇒
lim
x
→
0
x
sin
1
x
=
0
Now,
lim
x
→
0
x
sin
1
x
=
0
=
f
(
0
)
.
So the given function is continuous at
x
=
0
.
Suggest Corrections
0
Similar questions
Q.
If the functions
f
(
x
)
, defined below is continuous at
x
=
0
, find the value of
k
:
f
(
x
)
=
⎧
⎪ ⎪ ⎪ ⎪ ⎪ ⎪
⎨
⎪ ⎪ ⎪ ⎪ ⎪ ⎪
⎩
1
−
cos
2
x
2
x
2
,
x
<
0
k
,
x
=
0
x
|
x
|
,
x
>
0
Q.
If the function
f
(
x
)
defined as
f
(
x
)
=
⎧
⎨
⎩
3
,
x
=
0
(
1
+
a
x
+
b
x
3
x
2
)
1
/
x
,
x
>
0
is continuous at
x
=
0
, then
Q.
Let
f
:
R
→
R
be defined by
f
(
x
)
=
⎧
⎪ ⎪ ⎪ ⎪ ⎪ ⎪
⎨
⎪ ⎪ ⎪ ⎪ ⎪ ⎪
⎩
α
+
sin
[
x
]
x
i
f
x
>
0
2
i
f
x
=
0
β
+
[
sin
x
−
x
x
3
]
i
f
x
<
0
where
[
x
]
denotes the integral part of y. If f is continuous at
x
=
0
, then
β
−
α
=
Q.
Let f(x) be a function defined by
f
x
=
3
x
x
+
2
x
,
x
≠
0
0
,
x
=
0
.
Show that
lim
x
→
0
f
x
does not exist.
Q.
Let a function
f
be defined by
f
(
x
)
=
x
−
|
x
|
x
for
x
≠
0
and
f
(
0
)
=
2
then
f
is
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