1. Mar 31, 2008 #1

   ehrenfest

   

   Can someone please explain why the result of the following has an imaginary part when I put it into mathematica 6.0?
   
   

   Code (Text):

   Sum[Sin[n 6]/2^n, {n, 1, Infinity}]

    

   ehrenfest, Mar 31, 2008
2. 
   Phys.org - latest science and technology news stories on Phys.org

   • • Game over? Computer beats human champ in ancient Chinese game
   • • Simplifying solar cells with a new mix of materials
   • • Imaged 'jets' reveal cerium's post-shock inner strength
3. Mar 31, 2008 #2

   DeepakS

   

   Because

   Code (Text):

   Sin[n 6] / 2^n

   is

   Code (Text):

   2^-n * Sin[n 6]

    

   DeepakS, Mar 31, 2008
4. Apr 1, 2008 #3

   Crosson

   

   Wrap it in a full simplify command:
   
   

   Code (Text):

   FullSimplify[Sum[Sin[n 6]/2^n, {n, 1, Infinity}]]

    

   Crosson, Apr 1, 2008
5. Apr 1, 2008 #4

   ehrenfest

   

   So what?

    

   ehrenfest, Apr 1, 2008

• Log in with Facebook
• Log in with Twitter

Your name or email address:

Do you already have an account?

• No, create an account now.
• Yes, my password is:
• Forgot your password?

Stay logged in