If the function y = 3sin (2x + π 6) is known, then the equation of its axis of symmetry is () A. x=0B. x=-π12C. x=π6D. x=π3

From 2x + π 6 = k π + π 2, we can get x = k π 2 + π 6 (K ∈ z), let k = 0, we can get x = π 6, its equation of symmetry axis is x = π 6, so we choose C

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