Q82
Standard Integrals and Reverse Chain Rule
Qualitative Properties of Antiderivatives
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Let $f : (0,2) \rightarrow R$ be a twice differentiable function such that $f''(x) > 0$, for all $x \in (0,2)$. If $\phi(x) = f(x) + f(2-x)$, then $\phi$ is
(1) decreasing on $(0,2)$
(2) increasing on $(0,2)$
(3) increasing on $(0,1)$ and decreasing on $(1,2)$
(4) decreasing on $(0,1)$ and increasing on $(1,2)$