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Trig Identities

  1. Oct 24, 2009 #1
    1. The problem statement, all variables and given/known data

    By using trig formulas show that,

    sin(2x + pi/3) = sin(2x) + sin(2(x+pi/3))

    2. Relevant equations

    Trig Identities

    3. The attempt at a solution

    I've used double angle formulas, sin(a+b) formulas, I just can't seem to get it.
     
  2. jcsd
  3. Oct 24, 2009 #2

    CompuChip

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    It does look like a case for sin(a + b). Can you show us what went wrong when you simply apply the identity for sin(a + b) = sin(a) ... + ... to sin(2x + pi/3) ?
     
  4. Oct 24, 2009 #3

    lurflurf

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    write (for the left hand side)
    sin(2x + pi/3)=[sin(2x + pi/3)-sin(2x +2pi/3)]+sin(2(x + pi/3))
    recall the identity for
    sin(a)-sin(b)
     
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