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Byju's Answer
Standard XII
Mathematics
Derivative of Standard Functions
If [ 2 sin ...
Question
If
⎧
⎪ ⎪ ⎪
⎨
⎪ ⎪ ⎪
⎩
[
2
(
sin
x
−
sin
n
x
)
+
|
sin
x
−
sin
n
x
|
2
(
sin
x
−
sin
n
x
)
−
|
sin
x
−
sin
n
x
|
]
,
x
≠
π
2
3
,
x
=
π
2
where
[
x
]
denotes the integral part of
x
and
x
∈
(
0
,
π
)
and
n
>
1
Show that
f
(
x
)
is continuous and differentiable at
x
=
π
2
.
Open in App
Solution
We have
f
(
x
)
=
[
2
(
sin
x
−
sin
n
x
)
+
|
sin
x
−
sin
n
x
|
2
(
sin
x
−
sin
n
x
)
−
|
sin
x
−
sin
n
x
|
]
;
x
≠
π
2
f
(
x
)
=
3
;
x
=
π
6
I
f
x
∈
(
0
,
π
)
a
n
d
n
>
1
t
h
e
n
sin
x
⩾
sin
n
x
So,
L
.
H
.
S
=
lim
x
→
0
f
(
π
2
−
h
)
−
f
(
π
2
)
−
h
=
lim
x
→
0
[
2
(
sinh
−
sin
n
h
)
+
∣
∣
sinh
−
sin
n
h
∣
∣
2
(
sinh
−
sin
n
h
)
−
|
sinh
−
sin
n
h
|
]
−
3
−
h
=
lim
x
→
0
[
2
(
sinh
−
sin
n
h
)
+
∣
∣
sinh
−
sin
n
h
∣
∣
2
(
sinh
−
sin
n
h
)
−
|
sinh
−
sin
n
h
|
]
−
3
−
h
[
c
a
n
c
l
e
(
sinh
−
sin
n
h
)
]
=
lim
x
→
0
[
2
+
1
2
−
1
]
−
3
−
h
=
lim
x
→
0
[
3
]
−
3
−
h
=
lim
x
→
0
0
−
h
=
0
Now,
R
.
H
.
S
=
lim
x
→
0
f
(
π
2
+
h
)
−
f
(
π
2
)
h
=
lim
x
→
0
[
2
(
sinh
−
sin
n
h
)
+
∣
∣
sinh
−
sin
n
h
∣
∣
2
(
sinh
−
sin
n
h
)
−
|
sinh
−
sin
n
h
|
]
−
3
−
h
=
lim
x
→
0
[
2
(
sinh
−
sin
n
h
)
+
∣
∣
sinh
−
sin
n
h
∣
∣
2
(
sinh
−
sin
n
h
)
+
|
sinh
−
sin
n
h
|
]
−
3
h
[
c
a
n
c
l
e
(
sinh
−
sin
n
h
)
]
=
lim
x
→
0
[
2
+
1
2
−
1
]
−
3
h
=
lim
x
→
0
[
3
]
−
3
h
=
lim
x
→
0
0
h
=
0
So,
L
.
H
.
S
=
R
.
H
.
S
=
0
(
f
i
n
i
t
e
)
So,
f
(
n
)
is differentiable at
x
=
π
2
and also continous.
Suggest Corrections
0
Similar questions
Q.
If
f
:
R
→
R
is defined by
f
(
x
)
=
s
i
n
[
x
]
π
+
t
a
n
[
x
]
π
1
+
[
x
2
]
, then the range of f(x) (where [x] denotes integral part of x)
Q.
Consider
f
(
x
)
=
⎧
⎪ ⎪ ⎪ ⎪
⎨
⎪ ⎪ ⎪ ⎪
⎩
[
2
(
sin
x
−
sin
3
x
)
+
∣
∣
sin
x
−
sin
3
x
∣
∣
2
(
sin
x
−
sin
3
x
)
−
∣
∣
sin
x
−
sin
3
x
∣
∣
]
,
x
≠
π
2
f
o
r
x
∈
(
0
,
π
)
3
x
=
π
2
, where
[
]
denotes the greatest integer function, then-
Q.
If the relation between the order of integrals of sin(x) can be given by
∫
s
i
n
n
(
x
)
d
x
=
−
s
i
n
n
−
1
(
x
)
.
c
o
s
(
x
)
n
+
n
−
1
n
∫
s
i
n
n
−
2
(
x
)
d
x
; n > 0
Then find
∫
s
i
n
3
(
x
)
d
x
.
Q.
If
f
(
x
)
=
{
m
x
+
1
,
x
≤
π
2
s
i
n
x
+
n
,
x
>
π
2
is continuous at
x
=
π
2
, then
Q.
If
f
(
x
)
=
⎧
⎪
⎨
⎪
⎩
m
x
+
1
,
x
≤
π
2
sin
x
+
n
,
x
>
π
2
is continuous at
x
=
π
2
, then
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