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Math Help - Limits of trig

  1. #1
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    Limits of trig

    can someone explain to me why this is so? its not clicking yet




    I know tan = sin/cos

    the derivative of sin = cos

    the derivative of cos = -sin

    I just don't know how to piece all of this together

    Thanks
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  2. #2
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    anyone?
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  3. #3
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    It is just a matter of fairly simple algebra.
    There are no derivatives there.
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  4. #4
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    Quote Originally Posted by Plato View Post
    It is just a matter of fairly simple algebra.
    There are no derivatives there.
    well that makes me feel even worse because I don't even know where to start

    Edit:

    where does the multiplication of 2cos on top and cos on bottom come from?
    Last edited by silencecloak; October 7th 2008 at 07:15 AM.
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  5. #5
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    Quote Originally Posted by silencecloak View Post
    well that makes me feel even worse because I don't even know where to start

    they factored out the 2, turned tan into sin/cos and multiplied by a factor of one.

    that factor of one they used is cos/cos.

    should be easy peezy lemon squeezy after that.
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  6. #6
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    Quote Originally Posted by silencecloak View Post
    well that makes me feel even worse because I don't even know where to start

    Edit:

    where does the multiplication of 2cos on top and cos on bottom come from?
    they use it as a factor to reduce the equation further.
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  7. #7
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    Quote Originally Posted by p00ndawg View Post
    they factored out the 2, turned tan into sin/cos and multiplied by a factor of one.

    that factor of one they used is cos/cos.

    should be easy peezy lemon squeezy after that.
    Thanks, I feel pretty dumb lol. Just got to get used to looking at those problems the same way I do with regular numbered problems.
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