arccos(x) + arccos(-x) =
Ax
Bπ (since arccos(-x) = π - arccos(x))
C0
D2 arccos(x)
Answer & Solution
Correct answer: B. π (since arccos(-x) = π - arccos(x))
arccos(-x) = π - arccos(x) (reflection identity). Sum = arccos(x) + π - arccos(x) = π.
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