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Evaluation of definite integrals
Question
∫
0
3
x
1
+
x
d
x
=
Easy
A
116
15
B
15
116
C
0
D
115
16
Solution
Put
1
+
x
=
t
2
d
x
=
2
t
d
t
∫
1
2
(
t
4
−
t
2
)
(
2
d
t
)
=
2
(
t
5
5
−
t
3
3
)
1
2
=
116
15
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