Can you give us any hints? I tried findobj() but can't make progress!
You are on the right track with findobj(). The trick is what the call to "legend" does to the objects that make the solution very simple.
Remove the polynomials that have positive real elements of their roots.
Volume of this donut
Find the nearest integer
Generate a NaN...on purpose
Big numbers, repeated least significant digits
Big numbers, least significant digits
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