Trig Identity for Simplifying Expression | No Quotes

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SUMMARY

The discussion centers on the simplification of the trigonometric expression \(\frac{\sin(nx/2)}{\sin(x/2)}\). Participants conclude that there is no specific trigonometric identity that simplifies this expression for arbitrary values of \(n\) except when \(n = 2\). The alternative approach suggested involves rewriting the expression as \(\frac{\sin(x/2 + (n-1)x/2)}{\sin(x/2)}\), although this does not significantly simplify the problem.

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kqwan
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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!

Thanks!
 
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welcome to pf!

hi kqwan! welcome to pf! :smile:
kqwan said:
is there one specficic to use, or is there other ones that will help to simplifiy?

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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