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Homework Help: Help me to solve this equation pls

  1. Aug 25, 2010 #1
    1. The problem statement, all variables and given/known data

    i want to find the beta of this equation. i mean beta in one side and all other things next side. it is ok even if you provide the final answer without calculations.

    2. Relevant equations

    -2R*sin([tex]\beta[/tex]/2)*cos(K-[tex]\beta[/tex]/2)/sin(K+[tex]\beta[/tex])=d


    3. The attempt at a solution
     
  2. jcsd
  3. Aug 25, 2010 #2

    kuruman

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    What have you tried so far?

    I suggest that you first expand cos(k-β/2) and sin(k+β) and then use the half-angle trig identities to get rid of β/2 in favor of β.
     
  4. Aug 25, 2010 #3
    thanks. i did try to expand it but im zero in maths. please help
     
  5. Aug 26, 2010 #4

    kuruman

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    I have provided help by telling you what to do, but I am not going to do it for you. You can find the identities you need to do what I suggested in

    http://www.sosmath.com/trig/Trig5/trig5/trig5.html

    Look under "Sum-difference formulas" and "Double angle formulas." Begin by multiplying both sides of the equation by sin(K+β). If you get stuck, ask for help but show your work.
     
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