- #1
LagrangeEuler
- 717
- 20
Homework Statement
Derivative question
f=f(x) and x=x(t)
then in one book I find
[tex]\frac{d}{dx}\frac{df}{dt}=\frac{d}{dx}(\frac{df}{dx}\frac{dx}{dt})[/tex]
[tex]=\frac{dx}{dt} \frac{d^2 f}{dx^2} [/tex]
Homework Equations
The Attempt at a Solution
Not sure why this is correct? [itex]\frac{dx}{dt}[/itex] can depend of [itex]f[/itex] for example. Right?
Last edited by a moderator: