This is calculus question if you answer the question with the steps that would be appreciate

13. [-/4 Points] DETAILS LARCALCET8 4.3.057. Consider the function on the interval (0, 27). Use a graphing utility to confirm your answers for parts (a) and (b). f( x) = x - 2 sin(x) (a) Find the open intervals on which the function is increasing or decreasing. (Enter your answers using interval notation. ) increasing decreasing (b) Apply the First Derivative Test to identify the relative extrema. (If an answer does not exist, enter DNE.) relative maximum (x, y) = relative minimum ( x, y ) = Need Help? Read It