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Integrals
hard
0:00.0
Calculate
∫
0
∞
x
3
e
−
x
d
x
\int_0^\infty x^3 e^{-x} \, dx
∫
0
∞
x
3
e
−
x
d
x
.
A
3
3
3
B
6
6
6
C
24
24
24
D
12
12
12
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