Answers

2014-08-07T20:32:34+08:00
[(Tan 45°) + (Tan X) / (1 - (Tan 45°)(Tan X))] - [(Tan 45°) - (Tan X) / (1 + (Tan 45°)(Tan X))] = (Since Tan 45° = 1) --> [ (1+ Tan X) / (1 - Tan X)] - [(1 - Tan X) / (1 + Tan X)] = [(1 + 2TanX + Tan^2 X) - (1 - 2TanX + Tan^2 X] / [1 - Tan^2 X] = 4Tan X / [1 - Tan^2 X] (Since Tan 2X = (2TanX)/[1 -Tan^2 X]) = 2Tan 2X
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