[tex]\begin{gathered} \text{Which of the graphs change from increasing to decreasing at least one time?} \\ \text{Judging on the following choices from A to R, we have} \\ \text{C, a cubic function} \\ \text{K, a sine function} \\ \text{O, a cosine function} \\ \text{M, a polynomial function} \\ \text{P, a secant function} \\ \text{R, a square root of an absolute value} \end{gathered}[/tex]
