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jika sin B = 3/5 , maka cos B = 4/5 dan tan B = 3/4
maka (tan A + tan B) / (1-tan A * tan B) =
((5/12) + (3/4))/(1-(5/12)*(3/4))
(14/12)/(1-(15/48))
(14/12)/(33/48)
672/396