For what values of \( x \), the function \( f(x)=x+\frac{4}{x^{2}} \) is monotonically decreasin...

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For what values of \( x \), the function \( f(x)=x+\frac{4}{x^{2}} \) is monotonically decreasing
(a) \( x0 \)
(b) \( x2 \)
(c) \( x2 \)
(d) \( 0x2 \)
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