Uh oh! Wolfram|Alpha doesn't run without JavaScript.
Please enable JavaScript. If you don't know how, you can find instructions
here
.
Once you've done that, refresh this page to start using Wolfram|Alpha.
D[t = ln( [c + f*ln(g)] / [c + p*ln(g)] ) / ln(g), p]
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random
