Yep me out please where can I found the value of x in the triangle at the right?

We must first determine the shape of a rectangular prisms _ a0 to find area of the prism

Which is the completely factored from of xy^3-x^3y

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.