Plot a function graph for y = sin(x)/sqrt(1(cos(x))^{2}). Reduce the function to y = sin(x)/ sin(x). If sin(x) = 0 (for x=πn) then the function is not defined. For others x, f(x) = sign (sin(x)). The model is a movie. To navigate through the movie use Play, Pause, Stop, Previous step and Next step buttons.
