3 radical 3=-3 cot theta
on interval 0<theta<2pi
3√3 = -3cotθ
cotθ = -√3
cot is negative in QII and QIV
arccot(√3) = π/6
so, θ = π-π/6 or 2π-π/6
= 5π/6 or 11π/6
on interval 0<theta<2pi
cotθ = -√3
cot is negative in QII and QIV
arccot(√3) = π/6
so, θ = π-π/6 or 2π-π/6
= 5π/6 or 11π/6