Which of the following are identities? Check all that apply.
I
A. sin 6x=2 sin 3x cos3x
| sin3x - sirik = tang
CDs3x + CD5X
C.
sin 3x
2 = 4 CŨsX - SECX
sin XCOS X
D. (sinx + cos x) = 1 + sin 2x

Problem number 26 of the rhind papyrus says: find a quantity such that when it is added to of itself the result is a 15. the modern day equation that models this problem is x + x = 15. what is the solution to the equation? x = 10 x = 12 x = 15 x = 30