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# partial derivatives

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1. Find the indicated partial derivative. u = e3rx sin x
3u/∂r2∂x=
2. (Original post by Rose86)
Find the indicated partial derivative. u = e3rx sin x=
3u/∂r2∂x=
What seems to be the issue?
Whilst the computation is probably a little messy there are no real curve balls. . .
3. (Original post by joostan)
What seems to be the issue?
Whilst the computation is probably a little messy there are no real curve balls. . .
sorry???
4. (Original post by Rose86)
sorry???
Have you made a start on this? What have you got so far?
5. Differentiate twice with respect to r and then once with respect to x. It's the same process, three times.
6. (Original post by mik1a)
Differentiate twice with respect to r and then once with respect to x. It's the same process, three times.
Yes, I know. I know that. I did it but the answear is incorret😕
7. (Original post by Rose86)
Yes, I know. I know that. I did it but the answear is incorret😕
Sorry, I left my mind reader in the office.
8. (Original post by Rose86)
Yes, I know. I know that. I did it but the answear is incorret😕
If you post your working out we can look and see maybe where the error is.

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Updated: October 9, 2016
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