for this equation, y=vx, it's the same as v=y/x(adsbygoogle = window.adsbygoogle || []).push({});

however, if i differenate the 1st equation, dy/dx=v+x*dv/dx

and if i differenate the 2nd equation, dv/dx=(1/x)*dy/dx + [-1/(x^2)]y

but both differenated equations don't seem the same...

does somebody know where my calculuations went wrong?

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Calculation question

**Physics Forums | Science Articles, Homework Help, Discussion**