Who can buy me robu. x

Express the following as a function of a single angle, cos(60) cos(-20) - sin(60) sin(-20)

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.

According to the data set, where should the upper quartile line of the box plot be placed?