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Math Help - Rate of Change

  1. #1
    Junior Member
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    Aug 2009
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    Unhappy Rate of Change

    Find the rate of change of f(x,y,z) = cos(xyz) - ln(yz) + y(e^x) at the point (0,1,-1) in the direction toward the point (2,2,1).

    I'm not quite sure how to do this. I know I have to find the gradient of f(x,y,z) . But I don't know how to proceed after that.
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  2. #2
    MHF Contributor
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    I think this is directional derivative. So find the gradient then multiply by the dot product of the other vector.

    Directional derivative - Wikipedia, the free encyclopedia
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