Math Question: Given triangle ABC with angle A = 60 degrees and angle B = 80 degrees, find the measure of the angle bisector of angle A.
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Math question: Find the period of the function f(x) = tan x.
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Math Question: Given a triangle ABC where AD is the angle bisector of angle A, find the length of BD if AB = 12 cm, AC = 9 cm, and /_\BAC = 30 degrees.