1.37638 (rounded)
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tangent(54) is about 0.673800101
0.813
tan (30 degrees) would be equal to 0.577350269.
tan(1) = 1.5574 where the angle is measured in radians.
If B is 90 degrees, Tan A is BC / AB. But I don't know what you mean by Tan A by 2.