In which equation does have greatest value a 4x=52

Use the function f(x) is graphed below. the graph of the function to find, f(6). -2 -1 1 2

Which of the expressions (on the photo document i inserted) together represent all solutions to the following equation? 8cos(12x)+4=-4 *the answer should be in degrees.* > i would like for someone to explain the process to find the solutions for this.

Need solving this 2nd limit problem.