You might try looking for what is simple to do, first. Plug well know values in for x, and find the result of f(x). Plot each point. Make a table for x, 3sin(x), 2+3sin(x), 3cos(x), 4+cos(x). Try including a the domain from -2pi to +2pi.
If you'll try the rational expression as function on graphing calculator, you will see it is a sawtooth shape, raised above the horizontal axis.