Each cube is 1.5 cm long. Calculate the surface area.

4+6x-3x^3 in standard form with explanations because i don’t understand

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.

Cos^2x+cos^2(120°+x)+cos^2(120°-x)i need this asap. pls me