Got the following for
Here, I go astray. The answer provided to me for is .
Likewise for the other partials leads to :
Obviously not doing something right.
when we find the partial derivative with respect to, say x, we treat all other variables as constants.
let me do for you. you do the rest
Now means we find the second derivative of r with respect to x
based on what you said the answer was, you may be looking for it in a different form.
you may want to write:
and then use the chain rule
Then I started from there on the second total partial, using the quotient rule since I had r in the denominator. What you're showing is I should find the individual partials, , then , for each term, and then add them.
Which gives an answer of .