The frequency of a sinusoidal function can be determined by examining the coefficient of the argument in the sine or cosine function. In the case of f(z) = -2 sin (2) + 3, the argument in the sine function is 2, so the frequency is 2. This means that the wave completes 2 full cycles in one complete period of the function.
So the frequency of the function f(z) can be expressed as 2/1 in fraction form