Which expression is equivalent to (6^-2)^3

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.

Can someone answer it, and plot it, for 20 points and brainliest answer? p.s. they're the same ! : )

Solve this problem! extra ! 3025/5.5 = a/90.75 / = fraction