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Integrals
hard
0:00.0
Evaluate
∫
0
∞
1
1
+
x
2
d
x
\int_0^{\infty} \frac{1}{1+x^2} dx
∫
0
∞
1
+
x
2
1
d
x
.
A
π
/
2
\pi/2
π
/2
B
π
\pi
π
C
1
1
1
D
∞
\infty
∞
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