Answer:
At the maxium point
Explanation:
A maxium point is a point where the function gets the higher value. For example, in the basic sine curve, we can find a maxium point when
. We won't find any maxium point when x=0.
As you can see on the graph I attached, the zeros of a basic sine curve (or, said in other words, the points were x=0), are at the beginning, ath the middle and at the end of the function's graphic.