Just post them up and people will answer for you.
What are you being asked to find? The angle? X in radians?
Note: (sinx/cosx) = tanx
6sinx/cosx = 3
sinx/cosx = 3/6 = 1/2
tanx = 1/2
x = tan^-1 (1/2) = 26.56 degrees
Or if need it in radians, then multiply the degrees times (pi/180)