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Integrals
hard
0:00.0
Evaluate
∫
0
∞
x
2
e
−
x
d
x
\int_0^{\infty} x^2 e^{-x} dx
∫
0
∞
x
2
e
−
x
d
x
.
A
1
1
1
B
2
2
2
C
6
6
6
D
1
/
2
1/2
1/2
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