x1:=(y-sqrt(y^2))/(x-sqrt(x^2))
x2:=1/(y+sqrt(y^2))*(x+sqrt(x^2))
(x1=x2)$EXPR(INT)
x1-x2


So (x1=x2) was false before my recent commit 7af446cb,
afterwards it becomes true.

I think that is acceptable.

However (x1-x2) is not zero, before/after this commit.

That's caused by the '/' in 'reduc', common gcd factor
is removed from numerator on the first loop.

Shall we try to fix it?

Or reject it because it contains dependent algebraic kernels?

- Qian

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