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here is the question:

http://i44.tinypic.com/xe53tc.gif

here is the solution:

http://i43.tinypic.com/2nuokfq.gif

my first question regarding this whole thing is.

why when the doing the partial derivative by "r" we dont multiply by minus

the formula says (minus derivative)

but all they do is making a derivative without multiplying by minus?

http://i44.tinypic.com/xe53tc.gif

here is the solution:

http://i43.tinypic.com/2nuokfq.gif

my first question regarding this whole thing is.

why when the doing the partial derivative by "r" we dont multiply by minus

the formula says (minus derivative)

but all they do is making a derivative without multiplying by minus?

Last edited: