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Math Help - vector calculus - show that

  1. #1
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    vector calculus - show that

    Show that if are differentiable,



    I can do the exact same past exam question when it's cross product, but can't do this one even though its worth fewer marks!

    Starting from the LHS:





    But really cannot see anyway of getting anywhere near to the RHS from here!

    Could anyone please give me a hint?

    Thanks in advance!
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  2. #2
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    Quote Originally Posted by hunkydory19 View Post
    Show that if are differentiable,



    I can do the exact same past exam question when it's cross product, but can't do this one even though its worth fewer marks!

    Starting from the LHS:



    Mr F adds: {\color{red} + F_x \frac{\partial \phi}{\partial x} + F_y \frac{\partial \phi}{\partial y} + F_z \frac{\partial \phi}{\partial z}} ......

    But really cannot see anyway of getting anywhere near to the RHS from here!

    Could anyone please give me a hint?

    Thanks in advance!
    Product Rule!
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