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Which value does cos⁻¹(cos(7π/6)) take?
A7π/6
Bπ/6
C-5π/6
D5π/6
Answer & Solution
Correct answer: D. 5π/6
cos(7π/6) = -√3/2, and the angle in [0, π] with this cosine is 5π/6.
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