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Update maxMinTrueFalse9.tex #953

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2 changes: 1 addition & 1 deletion maximumsAndMinimums/exercises/maxMinTrueFalse9.tex
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Expand Up @@ -11,7 +11,7 @@

If $f$ is differentiable and decreasing on $(a,b)$, then $f'(x)<0$ on $(a,b)$
\begin{hint}
Think of $f(x)=-x^3$ on $(-1,1)$. $f$ is differentiable and decreasing, but $f'(0)=0$.
Think of $f(x)=-x^3$ on $(-1,1)$. $f$ is differentiable and decreasing, but $f'(0)=0$. So the conclusion should be $f'(x)\leq 0$ on $(a,b)$.
\end{hint}
\begin{multipleChoice}
\choice{True}
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