If f (x) = cos (3x - α + π / 6) is odd, then Tan α is equal to
F (x) = cos (3x - α + π / 6) is an odd function
Then f (0) = cos (π / 6 - α) = 0
π/6-α=2kπ+π/2
α=-2kπ-π/3
tanα=-tan(π/3)=-√3
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