If cot θ = cot 30° cot 60° and θ is an acute angle, then 2θ is equal to:
Explanation:
cot θ = cot 30° cot 60°
We konw, cot 30° = √3 and cot 60° = 1/√3
∴ cot θ = √3 × 1/√3 = 1
⇒ θ = 45°
⇒ 2θ = 90°
Hence, option (d).
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