Help help help please

Bradley hikes 12 miles in 3 hours. in relation to bradley’s hike, which statement describes the expression

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.

I’m stuck on this equation, anyone got the answer?