The function F(x) can be rewritten as F(x) = cos(9x/2 - π/4) + 1.

This function is a cosine function that is shifted vertically by 1 unit upwards. The period of the cosine function is 2π/9, the amplitude is 1, and the phase shift is -π/4.

The graph of this function will have a maximum value of 2 and a minimum value of 0, with the graph oscillating between these two values. The vertical shift of +1 will shift the graph upwards by 1 unit.