I need help proving the identity of an equation and also give what rule I am using as well. I really need this part to study for my final.

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.

The rectangle shown has a perimeter of 108 cm and the given area. its length is 6 more than five times its width. write and solve a system of equations to find the dimensions of the rectangle.

The vertices of a triangle are a(7.5), b(4,2), and c19. 2). what is