Hello people in mapleprimes,
I have an equation called aa in the following.
As for modification of this expression, I ask your favor to teach me.
Then, I want to change this aa to D(f)(x+theta__1*Dx,y+Dy)*Dx+D(f)(x,y+theta__2*Dy)*Dy.
But, to do so, I have to split aa into the one including -f(x,y+Dy)+f(x,y+Dy) between two terms
But, as maple cancels these terms, I can't do so. How can I insert two terms, then
obtain the expression D(f)(x+theta__1*Dx,y+Dy)*Dx+D(f)(x,y+theta__2*Dy)*Dy?
Thanks in advance.