Any good examples showing $\displaystyle {d2y}/{dx2} $of max/min point can be 0?
Thanks.
Hello, stupidguy!
$\displaystyle \text{Any good examples showing }\frac{d^2y}{dx^2}\text{ of max/min point can be 0?}$
mr fantstic nailed it!
$\displaystyle y \:=\:x^4$ is shaped like a parabola, but rises more steeply
. . and is "fatter" near the origin.
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There is a minimum at (0,0).
The concavity is 0 because the curve "flattens" slightly there.