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For the input -1/2, the principal branch of sin⁻¹ outputs
A5π/6
Bπ/6
C-π/3
D-π/6
Answer & Solution
Correct answer: D. -π/6
sin⁻¹ is odd, so sin⁻¹(-1/2) = -sin⁻¹(1/2) = -π/6, which lies in [-π/2, π/2].
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