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# Find the coordinates of all points where the curve $y= rac{1}{x^{2}+x+1}$ has a horizontal tangent line....

## Question

###### Find the coordinates of all points where the curve $y= rac{1}{x^{2}+x+1}$ has a horizontal tangent line.

Find the coordinates of all points where the curve $y=\frac{1}{x^{2}+x+1}$ has a horizontal tangent line.

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