Let \( f(x)=\frac{x^{2}}{\left(1+x^{2}\right)} \cdot \) Then, range...
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Let \( f(x)=\frac{x^{2}}{\left(1+x^{2}\right)} \cdot \) Then, range \( (f)=? \)
\( \mathrm{P} \)
(a) \( [1, \infty) \)
(b) \( [0,1) \)
(c) \( [-1,1] \)
(d) \( (0,1] \)
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