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Trig idents while computing limit

  1. Jul 23, 2017 #1
    My screenshots show an attempt at a solution and the given solution path from the book, but I can't seem to figure it out.

    Attached Files:

  2. jcsd
  3. Jul 23, 2017 #2


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  4. Jul 23, 2017 #3
    That is the identity I used to expand the (x+h) terms but could not factor to the next step due to the sin(h) term.... unless I made an error in my expansion that I haven't caught?
  5. Jul 23, 2017 #4


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    In your work, factor a sin(x) from the first 2 terms and cos(x) from the next 2 terms. You should now have the same as the solution guide. Note that it takes 2 lines to display theirs. I don't know what you've done in the denominator, though. .
  6. Jul 23, 2017 #5
    Thanks. I don't know why I didn't see that.
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