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Which line states the principal branch of cot⁻¹?
AR → (0, π)
BR → [0, π]
CR → (-π/2, π/2)
D[-1, 1] → [0, π]
Answer & Solution
Correct answer: A. R → (0, π)
Cotangent restricted to (0, π) is bijective onto R, so cot⁻¹ maps R onto (0, π).
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