At what value of x does the function attain maximum value?

1.	At what value of x does the function attain maximum value?
A.	e
B.	\(\sqrt {\rm{e}} \)
C.	\(\frac{1}{{\sqrt {\rm{e}} }}\)
D.	\(\frac{1}{\rm{e}}\)
Answer» D. \(\frac{1}{\rm{e}}\)

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At what value of x does the function attain maximum value?

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