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List the angles in [0, 2π] where sin x = −1/2.
Aπ/6 and 5π/6
B5π/6 and 7π/6
C4π/3 and 5π/3
D7π/6 and 11π/6
Answer & Solution
Correct answer: D. 7π/6 and 11π/6
Sine is negative in quadrants three and four with reference angle π/6, giving π + π/6 and 2π − π/6.
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