Substitution of dependend variable in differentiation
Subject: Substitution of dependend variable in differentiation
From: Marc Hodapp
Date: Wed, 14 Sep 2005 14:08:59 +0200
Hi everybody,
I have got a function u depending on x which I differentiate with
respect to x. I then want to substitute u(x)=l*U(x), in order to get
du/dx = l*dU/dx. What I have done so far is :
(%1) expr1:diff (u(x),x)
(%2) expr2:subst(l*U(x),u(x),expr1)
(%o2) d(l*U(x)) / dx
How can I obtain my desired result?
Many thanks in advance.
Marc Hodapp