Derivative with respect to a variable

[ahjukhir]

little rusty with my derivatives...

Question derive Eo with respect to r
En = -C/r + D^(-r/p)

C,D and p are all constants...

so far I have Eo = -Cr^-2 .. but then I am not sure about the exponential.

any help would be appreciated.
Thanks!

 

[tiny-tim]

Welcome to PF!

Hi ahjukhir! Welcome to PF!

(try using the X² tag just above the Reply box )

Hint: there's a special trick for this … rewrite D^-r/p as (e^ln(D))^-r/p = e^-(r/p)ln(D)