The maximum value of the sinusoidal function given is 5 .
The maximum value of a sinusoidal function is the peak of the waves as observed on (y-axis) of the sine graph. It can be called the crest of the wave formed by the graph of the function.
From the graph given, the y - coordinates of the crest value is 5. This is the value of the maximum. The minimum is the lower limit and it is 1 from the graph.
Hence, the maximum of the sinusoidal function is 5.