Answer:
1/4
Step-by-step explanation:
the argument in the cosine function is irrelevant for the amplitude of the graph (which is how high and low the graph swings). the 2x argument condenses the curve left and right, but had no impact on the height (the created functional values, which are still happening between-1 and +1). but the 1/4 factor changes the height, as now the functional values are between -1/4 and +1/4.
