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From tan x = tan α we conclude that
Ax = nπ + α, n ∈ Z
Bx = 2nπ ± α, n ∈ Z
Cx = nπ ± α, n ∈ Z
Dx = nπ + (−1)^n α, n ∈ Z
Answer & Solution
Correct answer: A. x = nπ + α, n ∈ Z
Tangent has period π, so equal tangents differ by a multiple of π: x = nπ + α.
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