How to solve? trig/precalc?? csc^4x-4csc^2x=0

help?
csc^4x - 4csc^2x = 0

(csc x)^4 = 4 * (csc x)^2

(1 / sin x)^4 = 4 * (1 / sin x)^2

1 / (sin x)^4 = 4 / (sin x)^2

1 / (sin x)^2 = 4

1 = 4 * (sin x)^2

0.25 = (sin x)^2

0.5 = sin x

x = 30 degrees, 150 degrees, 210 degrees, ...