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Difficulty proving another identity

  1. Oct 17, 2006 #1
    could anyone explain (no calculation) how to work the following identity so could get an understanding of it thank you

    tan(45+A)degrees tan(45-A)degrees=1
  2. jcsd
  3. Oct 17, 2006 #2
    Use the identities for tan(a+b) and tan(a-b).
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