Объясните, пожалуйста, как из [tex] \frac{1}{ x^{3} } [/tex] получилось [tex] \frac{1}{2x^{2} } [/tex]
[tex]f(x)=2- x^{3} + \frac{1}{ x^{3} }

F(x)=2x- \frac{x^{4} }{4} + \frac{1}{ 2x^{2} } [/tex]
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