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Integrals
medium
0:00.0
Evaluate
∫
0
∞
x
e
−
x
d
x
\int_0^{\infty} x e^{-x} dx
∫
0
∞
x
e
−
x
d
x
.
A
0
0
0
B
1
1
1
C
e
e
e
D
1
/
e
1/e
1/
e
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