Find the critical value(s) of
f
(
x
)
=
2
x
−
x
2
\displaystyle {f{{\left({x}\right)}}}={2}\sqrt{{{x}}}-{x}^{{2}}
f
(
x
)
=
2
x
−
x
2
.
Give exact answers, and separate multiple answers with a comma.
f
(
x
)
\displaystyle {f{{\left({x}\right)}}}
f
(
x
)
has critical values at x =
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