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Try y.collect_common_factors(). This gives the output you want.

You could also use factor(y,x^2) if you know upfront that you want to factor out $x^2$.

Try Try:

y.collect_common_factors()y.collect_common_factors()
.  

This gives the output you want.

You could also use factor(y,x^2) if you know upfront that you want to factor out $x^2$.