1. Sep 16, 2005 #1

   thenewbosco

   

   no clue how to start this:
   
   show
   
   sin 3x = 3 sin x - 4 sin^3 x

    

   thenewbosco, Sep 16, 2005
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3. Sep 16, 2005 #2

   Dr Avalanchez

   

   How to start this: sin(3x) = sin(2x+x)

    

   Dr Avalanchez, Sep 16, 2005
4. Sep 16, 2005 #3

   thenewbosco

   

   right so after doing this i get
   
   sin 3x = sin2x(cos x) + (cos2x)(sin x)
   
   whats next

    

   thenewbosco, Sep 16, 2005
5. Sep 16, 2005 #4

   Dr Avalanchez

   

   sin(2x)=...?
   cos(2x)=...?

    

   Dr Avalanchez, Sep 16, 2005
6. Sep 16, 2005 #5

   thenewbosco

   

   thanks for the help i got this and the others

    

   thenewbosco, Sep 16, 2005

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