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Trigonometric sum-difference formula for absolute values

  1. Mar 9, 2010 #1
    sin|x + y| = ?
    cos|x + y| = ?

    Is there any formula for these?
  2. jcsd
  3. Mar 9, 2010 #2


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    You can use the even/oddness of the functions to remove the abs bars or shift it to a constant outside, then apply the normal sum-difference formulas.
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