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Standard XII
Mathematics
Theorems for Continuity
Question
If the function f defined on
(
π
6
,
π
3
)
by
f
(
x
)
=
⎧
⎪ ⎪ ⎪
⎨
⎪ ⎪ ⎪
⎩
√
2
cos
x
−
1
cot
x
−
1
,
x
≠
π
4
k
,
x
=
π
4
is continuous, then k is equal to?
1
2
1
1
√
2
2
A
1
2
B
1
C
2
D
1
√
2
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Solution
Verified by Toppr
The correct option is
A
1
2
∴
function should be continuous at
x
=
π
4
∴
lim
x
→
x
4
f
(
x
)
=
f
(
π
4
)
⇒
lim
x
→
x
4
√
2
cos
x
−
1
cot
x
−
1
=
k
⇒
lim
x
→
π
4
−
√
2
sin
x
−
c
o
s
e
c
2
x
=
k
(Using L'
^
o
pital rule)
lim
x
→
π
4
√
2
sin
3
x
=
k
⇒
k
=
√
2
(
1
√
2
)
3
=
1
2
.
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9
Similar Questions
Q1
If the function f defined on
(
π
6
,
π
3
)
by
f
(
x
)
=
⎧
⎪ ⎪ ⎪
⎨
⎪ ⎪ ⎪
⎩
√
2
cos
x
−
1
cot
x
−
1
,
x
≠
π
4
k
,
x
=
π
4
is continuous, then k is equal to?
View Solution
Q2
If the function
f
defined on
(
π
6
,
π
3
)
by
f
(
x
)
=
⎧
⎨
⎩
√
2
cos
x
−
1
cot
x
−
1
,
x
≠
π
4
k
,
x
=
π
4
, is continuous, then
k
is equal to:
View Solution
Q3
The function
f
(
x
)
=
⎧
⎪ ⎪
⎨
⎪ ⎪
⎩
1
−
sin
x
(
π
−
2
x
)
2
x
≠
π
2
k
x
=
π
2
is continuous at
x
=
π
2
then
k
is equal to
View Solution
Q4
Discuss the continuity of the function
f
at
x
=
π
4
where
f
is defined by
f
(
x
)
=
1
−
√
2
sin
x
π
−
4
x
for
x
≠
π
4
=
1
4
for
x
≠
π
4
View Solution
Q5
If
f
(
x
)
=
√
2
cos
x
−
1
cot
x
−
1
,
x
≠
π
4
, find the value of
f
(
π
4
)
so that function f becomes continuous at
x
=
π
4
.
View Solution