What four digit palendrome has exactly one factor that is prime

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.

Given sin28.4=.4756, cos28.4=.8796, and tan28.4=.5407 find the cot of 61.6

Which expression is equivalent to 64 - 9x^2?