What the answer for 11 i’ve been stuck for a long time and i don’t get it

Find the value of x for which the lines are parallel.

Graph g(x)=2cosx . use 3.14 for π . use the sine tool to graph the function. graph the function by plotting two points. the first point must be on the midline and closest to the origin. the second point must be a maximum or minimum value on the graph closest to the first point.

The anwser cause i do not understand just plez