Which expression is equal to 7(1 3) ? a. 7 3 b. 7 4 c. 7 21 d. 1 21

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.

If x is 6, then 7x= a. 13 b. 42 c. 42x d. 76

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.