函数\(f\left( x \right) = \frac{{{x^2} - 1}}{{{x^2} + 2}}\)在\(\left( {

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函数\(f\left( x \right) = \frac{{{x^2} - 1}}{{{x^2} + 2}}\)在\(\left( { - 1, + \infty } \right)\)上的值域为___.

参考答案：\(\left[ { - \frac{1}{2},1} \right)\)