Question 931431
Find all solutions in the interval [0, 2π) (increasing order) for the equation below. Enter DNE in any empty blank.
9 cot^3 x = 3 cot x
divide both sides by 3 cot x 
3cot^2(x)=1
cot^2(x)=1/3
x=±√(1/3)=±1/√3
x=π/3+2πn,n=any integer
x=2π/3+2πn,n=any integer
x=4π/3+2πn,n=any integer
x=5π/3+2πn,n=any integer