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Evaluation of definite integrals
Question
∫
0
1
1
−
x
1
+
x
d
x
Easy
A
π
2
+
1
B
π
2
−
1
C
–1
D
1
Solution
∫
0
1
1
−
x
1
+
x
d
x
=
∫
0
1
1
−
x
1
+
x
2
d
x
,
x
=
sin
θ
=
∫
0
π
2
(
1
−
sin
θ
)
d
θ
=
π
2
−
1
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