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Byju's Answer
Standard XII
Mathematics
Second Fundamental Theorem of Calculus
If I = ∫x0[si...
Question
If
I
=
x
∫
0
[
sin
t
]
d
t
, where
x
∈
(
2
n
π
,
(
2
n
+
1
)
π
)
,
n
∈
N
and
[
⋅
]
denotes the greatest integer function, then the value of
I
is
Open in App
Solution
Let
I
=
x
∫
0
[
sin
t
]
d
t
⇒
I
=
2
n
π
∫
0
[
sin
t
]
d
t
+
x
∫
2
n
π
[
sin
t
]
d
t
We know that the period of
[
sin
t
]
is
2
π
, so using
n
T
∫
0
f
(
x
)
d
x
=
n
T
∫
0
f
(
x
)
d
x
⇒
I
=
n
2
π
∫
0
[
sin
t
]
d
t
+
x
∫
2
n
π
[
sin
t
]
d
t
⇒
I
=
n
⎡
⎢
⎣
π
∫
0
(
0
)
d
t
+
2
π
∫
π
(
−
1
)
d
t
⎤
⎥
⎦
+
x
∫
2
n
π
(
0
)
d
t
∴
I
=
−
n
π
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Second Fundamental Theorem of Calculus
Standard XII Mathematics
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