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Evaluation of definite integrals
Question
∫
3
6
x
9
−
x
+
x
d
x
=
Easy
A
2
B
1
C
1
2
D
3
2
Solution
I
=
∫
3
6
x
9
−
x
+
x
d
x
-
-
-
-
1
I
=
∫
3
6
9
−
x
x
+
9
−
x
d
x
-
-
-
-
2
(
1
)
+
(
2
)
⇒
2
I
=
∫
3
6
d
x
=
(
x
)
3
6
=
6
−
3
=
3
⇒
I
=
3
2
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