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bigfanatka @bigfanatka

July 2022 1 6 Report

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Найдите точки перегиба функции f(x) = [tex]e^{-x^{2}}[/tex]

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NNNLLL54

Verified answer

$f(x)=e^{-x^2}\\\\f'(x)=e^{-x^2}\cdot (-2x)=-2x\cdot e^{-x^2}\\\\f''(x)=-2\cdot e^{-x^2}-2x\cdot (-2x\cdot e^{-x^2})=4\cdot e^{-x^2}\cdot (-\frac{1}{2}+x^2)=0\\\\4e^{-x^2}\cdot (x-\frac{1}{\sqrt2})\cdot (x+\frac{1}{\sqrt2})=0\\\\e^{-x^2}>0\; \; \to \; \; x=\pm \frac{1}{\sqrt2}=\pm \frac{\sqrt2}{2}\\\\znaki:\; \; +++(-\frac{\sqrt2}{2})---(\frac{\sqrt2}{2})+++$

Точки перегиба: $(-\frac{\sqrt2}{2}\, ,\, e^{-\frac{1}{2}})\; \; ,\; \; (\frac{\sqrt2}{2}\, ,\, e^{-\frac{1}{2}})\; .$

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