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What does principal cosec⁻¹ give for input 1?
A0
Bπ/2
Cπ
D-π/2
Answer & Solution
Correct answer: B. π/2
cosec(π/2) = 1/sin(π/2) = 1, and π/2 lies in the cosec⁻¹ range [-π/2, π/2] excluding 0.
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