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Number of solutions to arctan(x) = π/3 in real x:

AInfinite
B0
C1 (x = tan(π/3) = sqrt(3))
D2
Answer & Solution
Correct answer: C. 1 (x = tan(π/3) = sqrt(3))
arctan is 1-1 from R to (-π/2, π/2). **So exactly one x:** x = tan(π/3) = √3.
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