The documentation for radcan says:
When `radexpand' is `false', certain transformations are inhibited.
`radcan (sqrt (1-x))' remains `sqrt (1-x)' and is not simplified
to `%i sqrt (x-1)'. `radcan (sqrt (x^2 - 2*x + 11))' remains
`sqrt (x^2 - 2*x + 1)' and is not simplified to `x - 1'.
(Note that there's a typo: 11 not 1.)
So, let's try it:
(%i7) display2d:false;
(%o7) false
(%i8) radexpand:false;
(%o8) false
(%i9) radcan(sqrt(1-x));
(%o9) sqrt(1-x)
This looks good.
(%i10) radcan(sqrt(x^2-2*x+1));
(%o10) x-1
Uh, that's not the documentation says.
What is supposed to happen here?
Ray