Confusing tbh someone help ‼️‼️

Iwill make brain if you me correctly fill this out needs due today pls and send it back to me (click the link and you will get it)

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.

What is the point of inflection for the function f(x)=2cos4x on the interval (0, pi/2)