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Mathematics
Mathematics
Problem
The maximum value of
x
e
−
x
xe^{-x}
x
e
−
x
is (a)
−
1
/
e
-1/e
−
1/
e
(b)
e
e
e
(d)
−
e
-e
−
e
(c)
1
/
e
1/e
1/
e
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