Given the coordinates of the vertices, classify the triangle as an equilateral, isosceles, or scalene. Then, find the perimeter, to the nearest tenth. Points: A(2, 5), B(-2, -1), C(6, -1)

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.