The solutions for cos^2 x - cos 2x =0, over the domain 0 < x < 2π are a. π/6 & 5π/6

b. π/2 & 3π/2

c. 0 & π & 2π

d. π/4 & 3π/4 & 5π/4 & 7π/4

*need to know steps*

Yolanda wanted to buy a total of 6 pounds of mixed nuts and dried fruit for a party she paid 21.60 for mixed nuts and 11.90 for dried fruit did yolanda but enough mixed nuts and dried fruit for the party