Given a ∈ (0, π), cosa = 1 / 3, then what is Tana?

Because a ∈ (0, π), cosa = 1 / 3 > 0,
So: a ∈ (0, π / 2); and then from (Sina) ^ 2 + (COSA) ^ 2 = 1, Sina = 2 (2) ^ 0.5/3
So: Tana = 2 times the root sign 2

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