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Math Help - show ∇ (a b) = b (∇a) − a (∇b) {solution inside, need explanation}

  1. #1
    Junior Member rubix's Avatar
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    delete this

    delete this plz, i was a bit rusty :S
    Last edited by rubix; February 4th 2010 at 06:41 AM. Reason: problem solved
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  2. #2
    Senior Member Sampras's Avatar
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    Quote Originally Posted by rubix View Post
    http://i47.tinypic.com/dhbhz.png

    ^ solution

    my question is how did they get from 2nd to 3rd step. The part with a_x, a_y, a_z etc

    Thanks!
    ok.
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