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Prove that the curve y=(x+1)/(x^2+1) h...

Prove that the curve `y=(x+1)/(x^2+1)` has

A

x = 1, the point of inflection

B

`x = -2 + sqrt3` , the point of inflection

C

`x = -1` , the point of minimum

D

`x = -2 - sqrt3` ,the point of inflection

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A, B, D
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