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Math Help - hard differential

  1. #1
    Junior Member
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    hard differential

    Can anyone differentiate this?
    cos(ytan(x))=ln(xy) The answer is \frac{(1+2cos(y)\frac{dy}{dx})(x-y)-(x+2sin(y)+4)(1-\frac{dy}{dx})}{(x-y)^2}=-cosec^2(y)\frac{dy}{dx} thanks id love to know like the stages before this!! My bad this was a mistake,,i know the answer sorry,,,read the wrong answer,,,i may posty another q here tho,,,,,''. ina few minutesXD
    Last edited by oxrigby; October 30th 2008 at 06:40 PM.
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  2. #2
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    did you leave out a close parenthesis ? ...

    \cos(y \cdot \tan(x)) = \ln(xy)

    or

    \cos(y) \cdot \tan(x) = \ln(xy)

    ?
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