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Homework Help: Core 3 level help

  1. Nov 2, 2007 #1

    Could someone please explain to me the following C3 level trigonometry question? I would really appreciate any help as I am completely stuck at the moment.

    Express tan2x/(1 - ((tan^2)2x)) in a more simple form.

    The answer in the back of the textbook is (1/2)tan4x.

    Thank you.

  2. jcsd
  3. Nov 2, 2007 #2


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    Homework Helper

    remember that [tex]tan2A=\frac{2tanA}{1-tan^2A}[/tex]

    does what you have look similar to that form?
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