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arctg(x)>x-(x^3)/3 inequation

A inequation with variable

The solution

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               3
              x 
atan(x) > x - --
              3 
$$\operatorname{atan}{\left(x \right)} > - \frac{x^{3}}{3} + x$$
atan(x) > -x^3/3 + x
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