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For the input -1/√3, principal cot⁻¹ gives which angle?
A2π/3
B-π/3
Cπ/3
D-π/6
Answer & Solution
Correct answer: A. 2π/3
cot(2π/3) = -1/√3 and 2π/3 lies in (0, π); the value -π/3 lies outside that range.
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