Derivative with respect to a variable

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The discussion focuses on deriving the expression Eo with respect to the variable r, specifically from the equation En = -C/r + D^(-r/p). The constants C, D, and p are defined, and the initial derivative Eo = -Cr^-2 is noted. A key insight provided is the transformation of D^(-r/p) into e^(-(r/p)ln(D)), which simplifies the differentiation process. This technique is essential for correctly handling the exponential term in the derivative.

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ahjukhir
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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!
 
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Welcome to PF!

Hi ahjukhir! Welcome to PF! :smile:

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

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

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