If cotθ = cot 30° cot 60° and θ is an acute angle, then 2θ is equal to:

90° 60° 45° 30°

90°

cotθ = cot 30° cot 60° =   √3 .  \(\frac{1}{ √3 }\) = 1 { we know, cot45º = 1 } So, θ = 45º Now, 2θ = 2 × 45º = 90º