Respuesta :

cot θ sin θ =1/2

we can write cot θ= cosθ/sinθ

(cosθ/sinθ) * sinθ =1/2

cancelling sinθ with sinθ

cos θ =1/2

θ = (5π/3) +2πn and θ = (π/3) +2πn

so θ=5π/3 and π/3 (for n=0)

option A is correct