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Homework Help: Find exact value difference identity

  1. Feb 13, 2009 #1
    1. The problem statement, all variables and given/known data
    Find the exact value of the expression Tan(3/4-12/5)

    2. Relevant equations

    tan(x-y)= (tan3/4 -tan12/5)/ (1+tan3/4tan12/5)

    3. The attempt at a solution

    I am not sure how to get exact values for these ratios. I havent been able to get past this point
     
  2. jcsd
  3. Feb 13, 2009 #2

    tiny-tim

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    Hi synergix! :smile:

    Why can't you just subtract 12/5 from 3/4, and then look up the tan? :confused:
     
  4. Feb 13, 2009 #3
    I amnot sure what you mean by look up the tan. I get tan(-33/20) when I subtract them. I can get the answer just not the exact answer.
     
  5. Feb 13, 2009 #4
    uhhhh..... I guess that would be the exact answer.... maybe I have confused myself haha.. I'm under a bit of pressure right now to get this done perhaps I have overcomplicated this
     
  6. Feb 13, 2009 #5

    tiny-tim

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    he he :biggrin:
     
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