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Homework Help: Simplifying a trigonometric binomial

  1. Apr 11, 2008 #1
    Is this correct?
    (bcos30-85.7)(bcos30-85.7)=b²cos²30-85.7cos30-85.7bcos30+85.7²
     
  2. jcsd
  3. Apr 11, 2008 #2
    You're missing a b term for 85.7cos30 and then you have to simplify.
     
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