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cosec⁻¹ at -2, on the principal branch, equals
A-π/6
B-π/3
Cπ/6
D-π/4
Answer & Solution
Correct answer: A. -π/6
cosec(-π/6) = 1/sin(-π/6) = -2, and -π/6 lies in [-π/2, π/2] excluding 0.
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