The function \( f(x)=\frac{x}{2}+\frac{2}{x} \) has a local minimum at (a) \( x=2 \) (b) \( x=-2...

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The function \( f(x)=\frac{x}{2}+\frac{2}{x} \) has a local minimum at
(a) \( x=2 \)
(b) \( x=-2 \)
(c) \( x=0 \)
(d) \( x=1 \)
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