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Homework Help: Trig identity exist?

  1. Jul 4, 2012 #1
    I look for trig identitiy to simplify this expression:

    [tex] \frac{\sin(nx/2)}{\sin(x/2)} [/tex]

    is there one specficic to use, or is there other ones that will help to simplifiy? I have been trying but can't make it simplier!

  2. jcsd
  3. Jul 4, 2012 #2


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    welcome to pf!

    hi kqwan! welcome to pf! :smile:
    i don't think so (unless n = 2)

    i think the best you can do is to write sin(nx/2)/sin(x/2) = sin(x/2 + (n-1)x/2)/sin(x/2) …

    but that doesn't help much :redface:
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