>
> > I have the expression sin(th)**2 and know that sin(th)**2 > 0 and I want
> > sqrt( sin(th)**2) = sin(th).
>
What you can do to get some simplification is to replace `th` with a real
symbol:
>>> var('th', real=1)
th
>>> sqrt(sin(th)**2)
Abs(sin(th))
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