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Math Help - Derivative question

  1. #1
    yoink
    Guest

    Derivative question

    I'm particularly confused on this question:

    Find the derivative:

    tan xy - (x^3)(y) = 3sec y + 7x^2


    My biggest confusion is the tan xy portion. I really don't know where to start on that. The rest I can probably figure out - product rule for the second term with dy/dx, and so on.

    Thanks in advance.
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  2. #2
    MHF Contributor
    Joined
    Apr 2005
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    1,631
    d/dx tan(xy)
    = sec^2(xy) *[x*dy/dx +y]
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