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Range of arctan(x):

AAll reals
B[0, π/2]
C[0, π]
D(-π/2, π/2)
Answer & Solution
Correct answer: D. (-π/2, π/2)
tan⁻¹(x): domain (-∞, ∞), range (-π/2, π/2) — open interval (tan is undefined at ±π/2).
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